Untethered 4.2.1 Jailbreak Requires Saved 4.1 SHSH Blobs!

Dev Team has announced that Greenpois0n will be updated within the next few days to allow for 4.2.1 to be Jailbroken. As of right now, the Jailbreak will be tethered for all 4th gen based devices (iPhone3GS w/ new bootrom, iPhone4, iPad, iPodTouch3&4) but Comex is hard at work creating a userland exploit to untether 4.2.1. Word is that this untethering will require 4.1 SHSH Blobs. If you have not saved your blobs yet, even if you are not currently Jailbroken and/or not currently using iOS 4.1, you can go ahead and use TinyUmbrella to save them. However, since 4.2.1 was just released, Apple will stop signing 4.1 SHSH blobs very soon (any minute really) and once that happens, you are out of luck!

Next are the owners of all the more recent devices. The good news there is that due to geohot’s limera1n exploit, all recent devices can be jailbroken (this will be true until Apple released new hardware that fixes geohot’s limerain exploit in the bootrom). The bad news is that right now, the 4.2.1 jailbreak is *tethered* on all of these recent devices. A tethered jailbreak means that each time your device loses battery power or needs to be rebooted, you must attach it to a PC or Mac to boot into the jailbroken state. @comex is working hard on a method that may untether the 4.2.1 jailbreak, but it will require you to have your 4.1 SHSH blobs in order to use it. No word on how much more effort it will take though (please don’t bug @comex about it!). (We also have an alternative method that may work, but @comex’s method is much more elegant.)

Also, if you plan on unlocking your iPhone or use unlock currently, please hold off updating to 4.2.1 until those tools are updated!

[TinyUmbrella Tutorial]
[Dev Team Blog]

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Reader comments

Untethered 4.2.1 Jailbreak Requires Saved 4.1 SHSH Blobs!


Okay, so I have a question. In Cydia, it says that I have SHSH blobs for iOS 4.0.1 - 4.2b3. So do I need to worry about saving anything through tiny umbrella? I've never used tiny umbrella before. I've always clicked "make my life easier" and every-so-often when I would open Cydia, it would add another iOS version (currently 4.0.1-4.2b3 as I stated above...) I'm still on 4.0.1.
I'm good, right?

@DaMoose I was going to say the same thing, iPads are now doomed to a tethered boot? Damn, I bought iTether and it was being really useful...
And what about that other jailbreak technique (was it greenpois0n, that got "paused" with limera1n's unexpected release)? Does it work or did Apple fix it like they feared?

@Eagleyesmith TinyUmbrella can download these blobs faster (now that they were already generated). I believe it's a good idea to run it and get them, the software is very easy to use, and you won't rely solely on Cydia's activation servers.

@WDV All old bootrom devies are untethered on 4.2.1. Still a good idea to save your SHSH blobs though.

@Wesley It is unclear right now what will happen with the iPad. We might have to wait a bit longer for an untethered JB.
The SHAtter exploit you are referring to is being saved for iPhone5. It is a hardware based and can only be fixed by a new bootrom, but hopefully Apple wont fix it next year :)

ok, new to this whole jailbreaking thing...how do i save this SHSH blobs? i don't wanna upgrade accidentally lol any help please : )

This might be a good time to think about doing a Jailbreak Glossary kind of post—I bet a lot of new jailbreakers could use a roundup of basic terms/ideas.

Same question as Maggard, I'm 3GS running JB 3.1.2. I have my SHSH blob for 4.1 saved Cydia says. How do I know if my bootrom is old or new?

Well, I have my iPad ssh blobs saved, but it doesn't have 4.1 blobs, because the iPad didn't even have a 4.1?
So, what happens to iPad users now?

Sounds like the geek team is screwing up. All this talk about easy jailbreaks for the near future and we're still hearing about tethered this & that, saving blobs, etc.
Maybe geohot will save the day again.

So with limera1n jailbreak I have now, I can update to 4.2 now?? And my iPhone 4 will still be jailbroken or I have to rerun the limera1n?

I'm still running iOS 4.0 with my JB. I have never updated and re-JB my iPhone 4. Do I have any concerns when the untethered JB comes out? Do I need iOS 4.1?? Thanks in advance.

Note that untethered when referring to a jailbreak means that you need no use redsn0w or other tool to BOOT your iDevice.
AFAIK this has nothing to do with internet tethering, so you can still use iTether on your untethered device.

Well here's a thing. I used redsn0w and jailbroke my ip4, but now safari just loads up then disappears again within a second.
Having to use google browser for the Internet, any links in email giveme the same 1 sec safari popup then back to homescreen again. Any ideas ?

Going to try a straight restore, then check safari. Then I'll try redsn0w again. Currently rebooted so I need to re-tether again when I get home.

Actually, cydia wasn't starting. So I went back in to redsn0w an selected just boot tethered. That sorted my safari problem.

@Trevor mobilesubstrate was the culprit to most issues. Cydia has now been updated with the new working mobilesubstrate. If u are having problems go into Cydia and make sure there are no updates.

Tethered Devices: iPhone 4, iPod Touch 4G, iPhone 3GS New Bootrom, iPod Touch 3G, iPod Touch 2G MC Model, and iPad
Untethered Devices: iPhone 3G, iPod Touch 2G Non-MC Model, iPhone 3GS old bootrom.

I have an Ipad with IOS 4.2.1 on it. I used TinyUmbrella to get blobs for:
- 3.2.2
- 4.2.1
- 4.2b3
So I don't have the blob for 4.1 (Never had IOS 4.1 on my Ipad either).
Will I still be able to jailbreak my Ipad untethered in the (near) future?

Sweet. Thanks for then needed info. I wonder when comex'll finish? Luckily Apple was still signing 4.1 when I downloaded TinyUmbrella! Can't wait for the unteathered jailbreak!

man this untethered jailbreak is taking longer than i expected, ive already jailbroken my iphone (tethered)n lemme tell u this sucks big time,no damn annoying to connect to pc everytime, n most of the tweaks,mods n apps jus wont work.im really getting fed up now,Ive been waiting for a untethered jailbreak for a long time n im losing hope now.thinking to restore back to my iOS 4.1..I hv my SHSH blobs saved..dun even know if this untethered jailbreak will released this year or not.the dev team r not even updating us about the untethered status, NOTHING!!

you cant go back to 4.1 because the latest version of tinyumbrella wont kick 4.2.1 out of recovery mode
you have to install a fresh 4.2.1

to vinneralways: Sure you can... just use RecBoot :to kick the iphone out of the recovery mode after restoring. And google about the instruction how to edit hosts file on your pc so that itunes allows you to downgrade :) anyway it's not so complicated and you can always go back to 4.1 and jailbreak it if only needed...

I saved my 4.1 untethered blobs...now what do i do next to have a 4.2.1 untethered jailbreak?..Help please...

So heres my dilemma.I bought an ipod touch 4th gen about a week ago with 4.2 already on it. I cant downgrade to 4.1 and jailbreak because i would need shsh blobs, but its obviously never been jailbroken. Is there ANY way to downgrade to 4.1 OR to jailbreak my ipod with an untethered jailbreak for 4.2? PlEASE Help me

hi, my itouch 4th gen is already in ios 4.2.1 when i got it recently.. does tt means i cant untethered jailbreak it? help pls..

I have the same question as Eunice and Gordon. I bought my iPod with 4.2.1 firmware on it. So would it even be possible to jailbreak it?

My iPod also came with 4.2.1 we all need helP someone be a hero and update us wether or not there will be and when a jailbreak for 4.2.1 that doesnt require shsh blobs will come out

What if i accidentally updated to 4.2.1. How would I retrieve the 4.1 SHSH blobs. And how would i trick iTunes into allowing me to downgrade with them?

If 4.1 shsh blobs will be required to untether, why wouldn't we just downgrade to 4.1 with the shsh blobs and use greenpois0n? If you have 4.1 shsh blobs saved, why stay on 4.2.1?