How to jailbreak iOS 4.2.1 iPhone, iPad untethered via greenpois0n [Mac users only]

Greenpois0n RC5 now allows you to jailbreak iOS 4.2.1 untethered on most devices including iPhone 4 and iPad. The best part? You won't need any SHSH blobs saved. redsn0w beta required you to have 4.2b3 blobs saved (and it was pretty unstable). Hopefully greenpois0n is going to be a much smoother experience for you guys. Hit the jump for a walkthrough on how to jailbreak iOS 4.2.1 with greenpois0n and for the answers to some commonly asked questions.

What devices will greenpois0n RC5 jailbreak?

  • iPhone 4/3GS
  • iPad
  • iPod Touch 2G/3G/4G
  • AppleTV second generation

You'll need to be running iOS 4.2.1 in order for this version of greenpois0n to work (4.1.1 for AppleTV second generation users).

Should I do a full stock restore first?

In short, most likely. If you're already stock and haven't been jailbroken, you're fine. Still back up your phone first in case anything goes wrong.

If you are currently jailbroken on 4.1, yes. Do a full stock restore to 4.2.1 and restore as a new iPhone. After jailbreaking, I still don't recommend restoring from a backup. Old jailbreak pieces can come with your backup and cause issues for you. Just my personal recommendation.

If you are currently tethered on 4.2.1 via redsn0w, you should be able to just run greepois0n right over your current jailbreak to untether. Some of the devs are saying if you have issues installing Cydia via greenpois0n after running it, simply run redsn0w again and let it re-install Cydia. Basically, as long as you aren't running a Monte version jailbreak on 4.2.1, you should be able to run greenpois0n to untether.

Will this jailbreak iOS 4.3 beta?

No. You'll have to wait a bit longer on a tested jailbreak for 4.3.

Jailbreaking iOS 4.2.1 via Greenpois0n

  1. Download greenpois0n onto your Mac. (Some users have been reporting the servers being down. If you can't get it to download right away, just be patient. Their servers are probably just lagging from all the traffic. There are a few mirrors out there so be sure to check the comments for the latest updates on those.
  2. Plug your iPhone, iPod Touch, iPad, or AppleTV in via USB (make sure the power is off) and follow the on-screen instructions to enter DFU mode.
  3. Greenpois0n will recognize when your phone is properly in DFU mode and start to do its thing. After it's done, you'll see a Loader icon on your homescreen. Tap it and install Cydia. (Note: This only differs for AppleTV jailbreakers. You'll be done but need to continue accessing and installing apps via Terminal and SSH.)
  4. You're done! Restore all your stuff (if you choose to or were stock before) and enjoy being jailbroken!

Note: Some users in the comments have been reporting sometimes the initializing error is a result of not holding the home button long enough when entering DFU mode. Even when the text is not greyed out anymore, continue holding the home button if you're getting the Initializing error even after trying Greenpois0n RC5 version 2.

If you guys have already used this version of greenpois0n, let us know how it's going in the comments! Have other questions? Check our our Jailbreak Starters Guide and jailbreak forums!

Allyson Kazmucha

Help and how to editor for iMore. I can take apart an iPhone in less than 6 minutes. I also like coffee and Harry Potter more than anyone really should.

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There are 205 comments. Add yours.

Anthony says:

I appreciate the hardwork, but this JB needs a bit of work.

tennenho says:

How so? It works EXACTLY as advertised. Do what it says, when it says, and it works. The end.

Mike4391 says:

No need to be offensive in your tone.

Derk says:

There's some incomplete information here about how to do this.
Iphone/ipad needs to be plugged in first and then turned off before the greenpois0n app is run. Next, follow the directions on the greenpois0n screen when you hit JAILBREAK button.

CristianTM says:

I'm getting this messages on a black screen:
Unable to fing gBdevList
Unable to find fsmount
Unable to find fs
unmount
Unable to find fsloadfile
And get stuck there.
I'm trying it on an already redwnow jailbroken phone.

Alli says:

Like Ally said in the article - restore first. You can't jailbreak a jailbroken phone.

Boots says:

Wrong, I did and it worked.

Allyson Kazmucha says:

Actually, yes you can. I said restore if you're on 4.1. If you were tethered on 4.2.1 already, you don't have to restore.
When you use redsn0w to tethered boot, you are essentially re-jailbreaking everytime.

Allyson Kazmucha says:

Follow the on screen instructions should have covered that. Greenpois0n tells you what to do. If I have to read you the directions off the screen, that is probably a good indication you shouldn't be jailbreaking ;)

Derk says:

Allyson,
There are a lot of folks having issues with jailbreaking(modmyi.com forums or tipb forums). Mine worked because I plugged it in and then turned it off before I followed the onscreen instructions.
No need to be offensive in your tone.

tennenho says:

This is listed all over as an "at your own risk" proposition.
If you can't read and comprehend, and act in accordance with instruction, you run the risk of borking your phone.
This has always been clear.
She's a blogger. It's not her job to coddle you.
This works, if done per instruction. The end.

Derk says:

Derek- If you write a GUIDE that says "How To" then I would expect the documentation to be complete. I was merely pointing out what else needs to be written in a GUIDE.
I am not expecting coddling. Mine jb worked the first time while I know other's didn't.
I guess you woke up on the wrong side of the bed. You seem to be looking for a fight.

fastlane says:

Derek. Don't assume Derk, or myself, can't jailbreak. I've jailbroken every model up until iPhone 4 with no problems. Not the point at all.
The point is that this is an incomplete "how to" for those unfamiliar with the process. It's always vague, presumptuous instructions like this, from aloof techies, that lead to people (who are unfamiliar) having problems. And to suggest that anyone, who isn't a mind reader, shouldn't be jailbreaking in the first place, is simply as arrogant as one can get.
There is zero point in posting an "almost how to". Period. :roll:

Nate says:

I can not find the right websight

Allyson Kazmucha says:

Oh my goodness, I assumed that people could read some on screen instructions within greepois0n. i am such a terrible person.
To all of you saying I wasn’t specific enough, no, I did not feel the need to retype what greenpois0n already clearly TELLS you to do in the on-screen instructions. If you can not follow instructions, I still stand by the fact you should not jailbreak. (And no, I do not suggest people that know nothing about jailbreaking to do it. read up on it first, that’s why we have beginner’s guides. Read those and come back to this post). Greenpois0n is an extremely easy tool to use if you follow the instructions.
I answered the most common questions and concerns, told you where to download greenpois0n, how to run it, etc… if you can not follow the instructions on screen, again, don’t jailbreak.
(and yes monk, i deleted your comment. if you can't post like an adult, i'll delete your comments.)

Monk says:

No worries kiddo. Enjoy the attention.

Allyson Kazmucha says:

@fastlane @derk and @monk
you 3 are out to pick a fight and nitpick. you win, I added "make sure the phone is powered off"
I also took a look around most other popular tutorials, they aren't much different than this one. the tool is easy to use. i'm not being arrogant in assuming all people are "techies". The tool really is that simple. Like I said, we have tons of beginners guides and tutorials for beginners (most of them written by me). If you didn't notice, those are also linked in the article, for that reason. Please don't assume anything. I help people consistently on twitter, in the forums, and via post ups. It's users like yourselves that make me NOT want to help people. Want to give me constructive criticism? That's perfectly fine. But if you can't act like an adult and choose your words appropriately, don't comment at all. Anything else rude or condescending will simply be deleted.

robes1 says:

The jailbreak was successful but the LoaderAPP isn't installing Cydia for me. I've restarted several times and ran the loader app several times and Cydia isn't showing up...any ideas?

Allyson Kazmucha says:

Try rebooting your phone? Sometimes Cydia didn't show up until I hard rebooted.

Dexter says:

YOU TELL UM, ALLYSON!!! :P

Barry says:

Worked like a charm. :)

JBC says:

This came as a shock to me. I did not anticipate seeing the JB until 4.3 was fixed. Does this mean that the exploit has been patched in the 4.3 betas?
Sounds like there are many issues...

parabel says:

As far as I heard, the exploit used here was indeed patched in the 4.3 betas, so there was no reason to hold it back anymore since Apple found it by themselves. Therefore, the chronic-dev team released it now.
And if you save your 4.2.1 hashes now, there's a big chance you will be able to untether-jailbreak 4.3 once it is released through an updated redsn0w with the Monte technique included.

Ken says:

Yes. Its been patched in 4.3
I assume they would not have released it if that was not the case, but one of the team members tweeted it- dont remember who.

Chad says:

Jailbreak worked perfectly, but the loader app doesn't do anything for me. It says "Loading Sources" then just nothing.

David says:

Mine did the same, but after several tries Loader worked correctly. I'm guessing the source servers are slammed this morning.

Scott says:

How many attempts at loading the Loader did it take you? Also, how long did you leave it to load between attempts?

Trent says:

It took my probably 30-50 times, at least a hour of trying last night. It finally worked though, the servers are slammed

B says:

Loader will not load cydia until the Greenpois0n website is back online. read it via twitter. I couldn't wait for that...so I just untethered with redsn0w, and worked like a charm :)

Allyson Kazmucha says:

You can also download redsn0w and run it and just choose install Cydia if greenpois0n won't install it, since it's bundled in the package :)

isuquinndog says:

Maybe I'm an idiot but...
Is this for Mac only? It says in these instructions to download to Mac, will it work with Windows?

isuquinndog says:

Nevermind, read the other post about it. sigh

Robert says:

Mac only. Windows version will be out soon.

Elijah says:

So should I bother using this to re-jailbreak? My phones already jailbroken using Redsn0w, but if Greenpois0n is full of bugs I won't bother...

Dan says:

at this point im just waiting for 4.3 and dev teams work.
the only thing worth updating for in 4.2.1 is find my iphone , other than that kind of a waste of time going through the whole process to update.

frozencloud says:

sigh...i guess us Window users must wait a little longer

dmkmedia says:

Am i going to lost all my tweak that ive installed on my 4.1 iOS like Bite Sms, Lock info etc ?

Alli says:

Yup. You might want to take a screenshot of your settings before you start this so it's easier to set back up.

Dan says:

download a program called pkgbackup,
then send the contact file to your email. You can then import it back when you load your phone back up and it will install your packages again automatically.

JKmca says:

I'm Jailbroken on 4.0.1 (used jailbreakme.com) do I upgrade all the way to 4.2.1 via itunes and then run this? Or is there a different way from going from an older version of firmware?

dpaul says:

no different way, nothing special, just restore as a new phone to 4.2.1 to have the best results after the jailbreak.
greenpois0n wont care what old os you had, so long as you have 4.2.1 now.

kingweb says:

What about unlocking the phone? Can iphone 4 still be unlocked with this? Do I need to save SHSH blobs if I want to keep it unlocked?

Dan says:

from what i have gathered is unlock doesnt work

parabel says:

SHSH blobs have nothing to do with unlocking. But if you want to keep your currently unlockable baseband, don't ever update/restore with an official IPSW simply through iTunes. iPhone 4 on official iOS 4.2.1 with the included baseband version is not unlockable at the moment, but MuscleNerd is working on it. Although you'll have to wait until iOS 4.3 is officially released.

Amaan says:

It doesn't work on my iPad!
I switched it off first carried out the jailbreak and it just keeps showing me a logo of the usb cable and iTunes.
iPad 4.2.1.
WHat am I doing wrong?

Steve says:

I got this as well with my redsnow tethered iPad. Even after powering down and back up it just showed the recovery screen after a few seconds and itunes asked to restore. I used a program called RecBoot to force it out of recovery and then I just used redsnow to boot it. I think I will wait and see if they bring out an update for GreenPois0n before doing this again. I tried at least 5 times and it failed each time.

jmonte345 says:

Does this jailbreak the 3G? I don't see it listed in the article.
Thanks.

tennenho says:

It says "works with."
If a device isn't listed there, what do you think?

jmonte345 says:

I was hoping that the 3G was mistakenly left off the list. So it didn't her to ask.

jmonte345 says:

So it didn't hurt to ask.

parabel says:

No, for the 3G use the most recent Redsn0w from http://blog.iphone-dev.org/post/1652053923/thanksgiving-with-apple (after reading everything there!) which has been out for a while now. With the 3G you don't have to worry about untethered/tethered jailbreaks ever - they're always untethered (luckily)!

Tom says:

dereck you are a wanker

Allyson Kazmucha says:

Please do not patronize people for asking an innocent question. Just respond nicely or don't respond at all.

rj5570 says:

I think I am going to wait. The tethered Jail Break from redsn0w has no bugs and I havent had any problems. I reboot it once a week just to clear things out, but I have been pretty happy with it. From the comments etc, I can not tell if this JB is buggy or not. But I do think I will wait for Dev Team's JB. 4.3 is right around the corner also, so why go through all this set up if your going to be moving to 4.3.
thats my 2 cents.

Yoshiro says:

i run on my mac it say.. the application "greenp0ison.app" can't run because the invalid architecture.. plzz help

justin says:

perhaps you do not have an intel-based mac?

Espo says:

Any mirror sites for greenpois0n? It says "Website Offline, No Cached Version Available" when I click on the mac button on the bottom of greenpois0n.com's site.

parabel says:

That's nice of you, but the RC4 version is a few months old and doesn't jailbreak 4.2.1 ;)
The correct version is RC5 or RC5-2 respectively, and it has only been released for Mac at the moment, though a Windows version should come out soon.

Steve says:

Really, Oops. Sorry about that

iphone4idiots says:

FYI, it seems greenpois0n won't run on Mac OS X 10.5.8

Yoshiro says:

so derk, the updated compatible with OSX 10.5.8 ? can't run on it..

Derk says:

Yoshiro, I have no idea. I just have 10.6.6 installed.

Derk says:

I just read on another forum. (modmyi.com) There's an update to the RC5 release for greenpois0n on the Mac.
Here's the URL: http://46.4.219.216/dl/greenpois0n-osxrc52.zip

Rinshu says:

Mine says complete yet I don't see the loader icon on home screen anywhere. Anyone seem this issue?

geekinthegarden says:

Rinshu,
I'm getting the same thing. I've tried several times. The process seems to go well and I get the message that the jailbreak is complete and the ipad reboots. I'm not seeing the loader icon. I think also this is supposed to be installing a modded apple icon at start-up which I'm not seeing. My guess is the process is not working but I'm not seeing any kind of error. I follow the prompts and hold the buttons and release at the specified time. Screen goes dark, greenpoison seems to recognize that iPad is in DFU mode and does it's thing. Some have suggested holding tho home button for an extended period beyond the point when it says completed but when i do that eventually I just end up with the plug into itunes screen on the iPad which means, I think, that it has gone into recovery mode.
I've tried this, probably 8-10 times and something is obviously wrong.

Bryan says:

I had the same problem until I started the process with my iPad off.

geekinthegarden says:

Thanks Bryan. I tried that to, still no go. I'm not seeing the white text at any point, just a black screen. Not sure what that might mean. I'm doing this on an iPad with a fresh upgrade to 4.2.1.

muzzymate says:

Can't seem to get past a few "Unable to find" then "Greenpois0n initialized"

muzzymate says:
  • message displayed on my virigin 3Gs with iOS 4.2.1
jack1328 says:

Restored iPad, still found displays "Unable to fing gBdevList Unable to find fsmount Unable to find fsunmount Unable to find fsloadfile" then waited many many minutes ipad restarts with no loader. I assume ipad jailbreak fail. Any ideas?

a4pike says:

Em, failed... i get to "Greenpois0n initialized", then i wait, and get afailure... :(

ShapetheL:OLa says:

Any Ideas why my Loader does not include a little thing? Its completely empty, just have the option to delete it thats all.

Jolokia says:

This is the exact same thing that is happening to me....

Hector says:

Having issues with the Loader. Any tips for this issue?

victor says:

Don't forget that if you do a stock restore and you're interested in reselling your phone at some point you have to preserve the baseband. Maintaining unlock-ability increases resale value quite a bit so keep that in mind.

Jolokia says:

Ok for those of you that have the Loader icon, but nothing in it, this is because the greenpois0n website is down. When it comes back online, the Loader app will function properly.

Allyson Kazmucha says:

Correct. Or you can use redsn0w RC8 just to install Cydia if you don't want to wait :)

Rinshu says:

modmyi.com <-- go here, read the responses under the greenposi0n topic. Grab the link to download the greenposi0nR5 from the responses. Install gpR5 reboot, then install cydia ONLY with the latest redsn0w. You now have a non-tethered jail broken phone with Cydia installed. The reason greenpois0n isn't working right now is because the app hits their website to run and the website is down. This is why we arent seeing the launcher install after it says complete. I followed the above steps and Im successfully jail-broken, running MiWi and have rebooted multiple times :)

tommyjaw says:

@Jolokia
is that the reason there is no icon and the missing files as well?

Jolokia says:

I dont think so, the best answer I have seen for that is that you may not be holding the home button down long enough, hold it down long after the app says complete, I did it until the device rebooted.
I did it and had the Loader icon (on the last page) the first time, just nothing inside of it as of yet.

amoderndrifter says:

Ally,
Guide is perfectly fine. Jailbreaking, while not rocket science, isn't for everyone. Update link to new RC5, pat yourself on the back, and call it good. Following guide worked for me and my non-noob friends. Thanks for the post!

Frodo says:

Hi, i'd like to know if this process (jailbreaking) is completely reversible. Thanks in advance!

Allyson Kazmucha says:

Sure is. Simply restore your phone in iTunes if you don't want to be jailbroken anymore.

Adam says:

Yes it is. You just do a restore using iTunes.

Guacho says:

I LOVE Ally.... better waiting for 4.3 jailbreak and then sell my iphone before the next one arrives..

Misael Ruiz says:

Can i just run this over my redsn0w tethered jailbreak? help please

arin.failing says:

oops... that is, IF you have a Mac (which, I guess you would hafta have to do the reds0w tethered jailbreak). So NVM this comment. haha

Scratch says:

I'm not sure if this has been completely answered or not so sorry if it has....I have a jailbroken iphone 4 (4.2.1) with redsn0w so it is tethered. I have a few questions:

  1. If I run greenpois0n will I have to install all the tweaks/apps etc all over again?
  2. If the loader doesn't work, can I simply run the redsn0w I used to jailbreak it and install Cydia from there?
  3. Should I still start off with the iPhone turned off or does it make any difference?
arin.failing says:

There are so many stinkin comments, that i stopped looking for what i'm about to suggest. So if it's already been said, please forgive me.
Allyson,
Would you mind providing an update that explains that some users may have to hold the home button the entire time that greenpois0n is jailbreaking? I was one of those users, but I did use what resources I already had at my fingertips to find the solution (hint/wink to all who are not using the CPU in front of you to HELP YOURSELF). I assumed (as I'm sure many others did) that when the text un-bolded, that that meant I could stop performing that action, seeing as that's how it performed whilst performing the entrance into DFU mode. I have seen a lot of comments/blogs/tweets/WHATEVER stating that they get the four lines and the "greenpois0n initialized" screen, as I experienced.
Just a thought...

dylan fox says:

I am not an expert in Jailbreaking by any stretch of the imagination. I am actually a novice. But I did "successfully" Jailbreak my phone with Green's newest release BUT the loader isn't working and I can't install cydia. It did work once and now the cydia app is just a blank icon that does nothing.
Why would this be released if everyone was going to have issues with it?
I do greatly appreciate the work they do. Has anyone found a way around this?

Kristen says:

Worked for me. Almost as easy as L1merain.

slalomskie says:

Can't wait for the comments when the PC Jail break comes out, you mac users are hard core and bitchy.

Jolokia says:

I am getting kind of annoyed that the Greenpois0n website is still down. I still have the Loader icon with nothing inside of it...

Allyson Kazmucha says:

download redsn0w rc8 and run it, only check the box "install cydia" and you should be good :)

robnaj says:

There is an app that puts your iOS devices into DFU mode for you it is called LAST DFU R5 [beta] (for mac only) find it at iPhondroid.com

Jeff says:

Does anyone know if/when the Loader icon will be fixed? All mine says is "Loading Sources".

HO says:

I get loading sources for a while then get this error message:
'Error
Please make sure that you're connected to the internet before launching loader'
I click on dismiss as its the only option here. Then only option available is to 'remove loader.app or cancel in options for open loader app.

reza says:

greenpois0n doesn't work for me on windows or on Mac. (Ipad 4.2.1)
When i start greenpois0n and click to jailbreak it goes do DFU mode then the loader bar starts to work and after 5 of 10 seconds my Ipad restart and then i get the Connect to iTunes on my screen.
Can anyone Help??

sergi says:

I’m getting this messages on a black screen..
Unable to find gBdevList
Unable to find fsmount
Unable to find fs
load_file
Greenpoison initialized
HELP PLEASE!!

pax says:

How about a Windows version???

SEan says:

I went from a tethered jailbreak done on redsnow to this one fairly smoothly. The first time I tried, I guess I let off the home button too soon. The second time, I just held it down longer. I've just rebooted it twice untethered to make sure.
The official site was offline so I just got it through a torrent site.

Brave says:

Hi Guys,
So if I jailbreak can restore my backup on iPhone 3GS. That way I can have all my apps and so I won't have to re-complete the games?
Thanks

Calium says:

Before you tend to jailbreak your iphone, please right click on your device name(in iTunes) click on Transfer Purchases.
After you complete upgrade/jailbreak, Click on Sync App.
All Apps and Saved games will remains

Wafla says:

How can i use greenpoison on mac os 10.5.8?

smack518 says:

I would like to know as well. I cannot even get the app to launch, much less not install Cydia.

Sharon says:

I get the same problem here. The app fails to launch in os 10.5.8. Anyone can help? :(

Bob McG says:

Same problem here, I ended up finding a mirror site with it, but it instantly crashes on 10.5.8

TJK says:

there has to be a way to rub on OSX 10.5.8... any suggestions?

lililoloil says:

you guys are all retarded

Megaz says:

is this a permanant jailbreak

Steve says:

Same here. Cannot even get the app to launch. On both 10.5 and 10.6.

Ethan says:

No unlock though, right? Baseband 03.10.01

Keisuke says:

You need to edit the line :
Will this jailbreak iOS 4.3 beta?
No. You’ll have to wait a bit longer on a tested jailbreak for 4.3.
It should read:
Will this jailbreak iOS 4.3 beta?
No. You’ll have to wait until just before the release of 4.4 on a tested jailbreak for 4.3.

Tom G says:

Worked like a charm! got an error using version 1, but when done with version 2 everything works perfectly!!

peterg81 says:

hi everyone, i'm a newbie when it comes to Jailbreaking. I was finally able to download the app this morning. it's my first time and accidentaly deleted the Loader. Will I need the loader later? if so, how can get it again? do i need to run greenpois0n again? thanks

Bob McG says:

I'm not getting a slow server error for greenpois0n, it's just telling me that file no longer exists when I click the Mac Download link, on their page. Do you think they moved it because of traffic?

Paddy says:

It works on my iphone4, yet needs to unlock, installed Cydia.
The most important part is timing. Make sure that the top right button is "sleep" and the round one on the face is "home", yes a bit confusing for a very old man like me.

Jeremy says:

Wow, that was easy. Was actually easier than rooting my Android phone. Thanks guys.

Calviscerate says:

Worked great! Sorry for the noob question but if I wanna unlock it in the future, there'll be no problems right?

Urbanite says:

Hi Everyone, I have previously jailbroken with limera1n on IOS 4.1. Is it possible for me to now jailbreak to 4.2.1 with Greenpoison and if I can are there any steps I need to take before doing so. Thanks!

Miktia says:

I think it's ok. Just update normally via iTunes and then jailbreak with greenpois0n.

Evan says:

Will this jailbreak work on an iPhone 3G running iOS 4.2.1?

reza says:

I’m getting this messages on a black screen..
Unable to find gBdevList Unable to find fsmount Unable to find fsload_file Greenpoison initialized

Akhil says:

I have the same problem. Were you able to JB your device? Any suggestions how to overcome this?

michael says:

so i jailbroke and installed cydia successfully but i am unable to download any of the apps within cydia. i click install and nothing happens. any suggestions?

Ash says:

It works. Thank you very much, that was long a wait.

Raja Tanveer says:

just finished jailbreaking 4.2.1 untethered with greenpoison latest version.works great.everything is fine.cydia is hot.loving it.guys,go for it

steve says:

under instruction number 4 in the article it says, "You’re done! Restore all your stuff (if you choose to or were stock before) and enjoy being jailbroken!"
Does that mean I should restore my phone from the backup I made right before I jailbroke? or should I just leave the phone the way it is after the jailbreak??

Jeff says:

leave your phone the way it is. You made the restore for yourself in case you ever want to set it back to factory. Your phone jacks up and you need to go to AT&T or apple, simply restore and they cant tell it was ever jailbroke. (even though its legal)

Alex says:

Does that mean that none of the apps music and stuff on the iPhone are erased during the JB? So it's fairly certain apps aren't removed after the jailbreak.

Jeff says:

Just installed greenpois0n over top of my tethered redsn0w jailbreak and it worked 1st try. I didn't backup/restore anything on my phone. Cydia works, all my settings stayed the same. Reboots just fine untethered.

Nicole says:

Worked perfectly for me..do I need to keep the loader app on my phone or can I remove it?

Tj says:

Hi there
is there a step by step guide somewhere for the noob like me?
I have original 3.2.1 os on my Ipad and I want to update it to 4.2.1
Thanks!!!

BigD says:

Hey, I downloaded greenpoison and keep getting Iads at the top of VWallpaper and whenever I add wallpaper in Cydia! I've searched and can't find a dang way to remove the adds

dom says:

wowee zowee finally my ipad gets a makeover. went
fine. tipb rocks.also on ipod 2g.took your advice on a fresh install.can i throw the loader app now?

JCRod says:

Sorry, I'm new to this, can Greenpois0n be downloaded on PC or only Mac?

J3POY says:

What cool app can you guys recommend for iPad 4.2.1 if I jailbreak. are there a lot of apps for the iPad just like the iPhone on Cydia?

David says:

Been waiting for this as I hadn't upgraded my iOS since 4.0.1. Did a fresh install of 4.2.1 and jailbreak went as smooth as you'd imagine. Especially like the prompting to get into DFU mode.

JD says:

How do you UN-jailbrake a phone? Nobody has a good article about this, including gotchas, etc.
If I do this and 4.3 comes out in a week, how do I get on 4.3 without messing with my apps and data.

akpak says:

How is this an "un-tethered" jailbreak if you have to plug in the device via USB?

David says:

"An untethered jailbreak is a type of jailbreak where your device does not require you to reboot with a connection to an external device capable of executing commands on the device." -thiphonewiki

pow says:

How will this affect my current unlock?

medicmaestro says:

Just completed the jb with RC6...couldn't be happier, though it took a while for greenpois0n to do it's thing.

Ralph says:

hey i hope you can help me out with this, because i dont understan

Ralph says:

umm sorry about that here is the continuation of the previous message. so i downloaded the greenpoison software. my itouch is off when i plug it onto my pc (laptop). i am able to put it successfully into dfu mode, but then it says failed, try again so do it again and same thing happens agains....so what do i do to fix this and also its a 2nd gen of ipod touch

Eric says:

On the computer it says jailbreak complete but the cydia app isn't on my home screen anywhere on my iPod I have a 4 g one

dino says:

This needs to be updated. greenpois0n has been updated with the ibooks fix.
no need to restore, just run the new greenpois0n rc 6.1 right over your current 4.2 jailbreak. works like a charm.

Sahil says:

Are there any chances of bricking??

Gustavo says:

Has anyone tried this on the 4th Gen iPod touch? Will it work?

Les says:

Does anybody use the windows version of it? Did it work?

zimbruce says:

Hi, i've been looking for an answer to this for some time now - please can someone give me some advice??
Ive recently purchased an iphone 4 16GB running on iOS 4.2.1 with baseband 03.10.01. The phone was purchased through vodafone whom have informed me that the iphone is factory unlocked or does not have a carrier/sim lock.
I am ONLY looking to jailbreak the device untethered so i can access 3rd party packages, obviously not unlock it. (On Mac OSX)
Several forums have suggested using redsnow 0.9.7b6, others have said this purely depends on an already tethered jailbroken iOS with the correct SHSH blobs to work.
Some recommend preserving baseband with tiny umbrella if you are going to jailbreak, others have recommended using greenpoisOn rc5, some say rc6…etc
All i want to know is what to use for Jailbreak only - untethered ofcourse.
Also
Will this affect my existing baseband at all?
Will there be any trace of it ever have been jailbroken if it is sent into Apple after a factory restore?
Many thanks to anyone who can answer all of these questions, or preferably has performed the same jailbreak as i am hoping to.

Kris Gerdes says:

I recently jailbroke my phone & have tried both Pdanet & Mywii & am able to connect via usb to get an internet connection but cannot use my phone as a hotspot w/my Windows 7 computer. My Vista & xp computer will wk but not 7. HELP!!!

Rory says:

It's not working for me on iOS 4.2.1 modem firmware 03.10.01 . Greenpoison works and my iPhone starts scrolling through white-text-code like it is going to work, then it says "Error, no successful firmware download after 60000ms!! Giving up....."
Can anyone help me with this? plz and thx

Tony says:

I finally gave in and untethered my redsn0w jailbreak. greenpois0n made it so painless and wonderful, fast too. So happy that I can just reboot my iPad now and not have to fuss with DFU mode.

Nhlanhla mzoneli says:

woah..., i was so scared this wasn't going to work for my ipad, vie had people telling me, don't do it, it"ll mess ur ipad, but i did it, and the results.... me.... a happy man... well done, i've just got 1 more question, how do you get apps for free(the ones on sale)

Vick says:

its not working on windows 7..everytime i try to jailbreak its get failed n my iphone restarts..plz help me out.
iphone 4-4.2.1

miK says:

How long should I have to wait while in the "downloading jailbreak date?" It is taking, to me, to be an exceptionally long time, compared to the video.

just a guy says:

im stuck on the screen with the white codes, keep sayin faild to get apples5l8920xarm7m after xxx sec.
can someone tell me y?
pls n thx

q123 says:

what about greenpois0n jailbreak 4.2.1 on windows

sam says:

i followed the steps of holding sleep relaseing and holding home but it keeps saying "failed:(" any suggestions?

John says:

when you jailbreak your iphone will you still have all your apps

Ben says:

Hi im trying to jailbreak my iphone 3gs with 4.2.1 and ive got the latest greenpois0n but it wont acknowledge that my phone has gone into DFU, anyone know why this is the case and how can i resolve this issue?

someone says:

did that, but why is it takinjg so long?

Tj Mongol says:

I just tried it. Everything went fine until Cydia kept on getting stuck. So I tried to reset my iTouch, then the screen went black. Then the greenpois0n logo was on. And also, when i tried the emergency shut down button, it kept on doing the same thing over and over again. So what do I do if it's turned off and stuck?

Jason Ryan Navarro Cruz says:

my ipad is jailbroken using redsnow and it is a tethered jailbreak, on 4.2, but when i just run greenpoison, and jailbreak it, nothing comes up, just an apple logo, and its stocks in there, ~.~ can some please help me?

Harneyn says:

i have a 3gs and i turn of my divice do the three steps and nuthing happends

SthaBik says:

I have iphone4 i followed the process but nothing happened.

Hylien69 says:

Yeah nothing showed up on my iPad either.

Cduml says:

Hey idk anything about this stuff but i jailbroke my ipod touch 4.2.1 i wanna update my ipod to the latest version thru itunes . Idk if its safe though plzzzz help thanks -email :cduml@yahoo.com

uj says:

i tryed to ailbreak it and it worked but cydia wont open e-mail me when its fixed pwease kieranversak@yahoo.com

Daddyhappy says:

Worked awesome on my gf phn 3gs 4.2.1 just had to do it a few times hav some patience and dont unplugg yor phn till its all done loading

Jay_rocks_da_world says:

Can you download other apps from the loader besides cydia??

Jailbreak iphone 4.1 says:

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Thanks for valuable blog post. I really happy with your blog article post. I keep it up regular manner post.

Idk says:

i did this with iPod touch 2nd gen 4.2.1 ios and it worked fine

raufath says:

but for me it didnt work

Idk says:

i did this with iPod touch 2nd gen 4.2.1 ios and it worked fine

Idk says:

i did this with iPod touch 2nd gen 4.2.1 ios and it worked fine

jamie bishop says:

will i remove all my apps ipod touch 2g

Abdalla Alia says:

Really.......The Best Way ......^_^

Nate says:

I can't find the website for it

Madeline says:

Will this work on an iPhone 3g, not a 3gs? I know I'm behind the times, but I got it for free.

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