Jailbreaking iOS 4.2.1 - what you need to know

With iOS 4.2.1 being released to the masses today, here's a couple tips for jailbreakers. If you're on iOS 4.1 and jailbroken, by this point you should know how to save your SHSH blobs via TinyUmbrella or Cydia.

As of right now, most jailbreak methods that work on iOS 4.2.1 are pretty hairy. I highly suggest waiting to upgrade for the official tools, but if you feel the need to give it a try right now, I've put up an iOS 4.2.1 jailbreak guide in our forums. Ask questions, give answers, and help eachother out. You can always visit our general jailbreak forum and post other questions and find answers about other topics as well.

Whatever you decide to do, let us know how it works for you!

Update: The Dev-Team has updated their blog giving everyone a bit more information about iOS 4.2.1 and how it'll affect all devices. Make sure you read it and heed their warnings when updating. It's looking like older devices will have an easy upgrade route to a jailbreakable 4.2.1. Newer devices are (as of now) tethered. I urge anyone who wants to upgrade to weigh their options before deciding to upgrade. You may lose your jailbreak or be tethered. A tethered jailbreak basically means if your phone battery dies or you need to reboot, you'll need to be connected to a computer to enter into a jailbreak state again. They're somewhat of a pain and I'd suggest waiting for an untethered jailbreak. You probably won't be waiting long. Until then, make sure you have your 4.1 SHSH blobs saved via Cydia or TinyUmbrella!

Allyson Kazmucha

Editor for iMore, Potter pundit, and the ninja in your iOS

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There are 25 comments. Add yours.

BBYM#IM says:

Can't wait for an official release!!!

CristianTM says:

Waiting for official release.
From 4.2, the thing that I really want is find my iphone... but I have some days of free trial from mobile.me, so no problem to wait. THere are some other updates that I also want, but no need to hurry. So, let's wait! :D

Jordan says:

Always safer to wait till the DevTeam gives the thumbs up...4.2 is not a huge enough upgrade to rush anything.

Raul says:

Is there baseband update on iOS4.2.1 and why are there iOS4.2 and iOS4.2.1?

Farbod21 says:

As of right now 4.2.1 is TETHERED and Cydia is still not officially updated to support it. Please wait.

Farbod says:

Also you will lose your ability to unlock if you update. Please hold off until tools are updated.

Andrew Wray says:

Definitely holding out for the official tools as far as my iPhone goes.

Brian Tufo says:

Hopefully it's soon as my apple tv will be here any day now. I really want AirPlay!

Looveeeaa says:

And desimlock ? , When ? :'(

Chris says:

Jail breaking is designed for those teenie boopers.

ctt1wbw says:

I am assuming that an unlock for a 3G iPhone under 4.2.1 is coming or is that not unlockable?

Farbod says:

@Wayne its coming... hopefully ;)

Chris2 says:

@chris
Consider me a 27 year old jailbreaking, tethering fool. Lol. Hail the unltd data plan. 6gigs n counting this month.

jt says:

IIRC, dev team saying the unlock will be available 2 days post 4.2 release.

Farbod says:

@JT thats for the old baseband processor (2G,3G, old 3GS), not on new devices. At least that is what they are hinting at publicly. Newer devices have a longer wait...

colemaneuclid says:

Patiently waiting for the 4.2.1 JB. Yet somehow I know I'll be checking TiPb every few hours till release 

Jahnn Hendriks says:

@Chris + @Chris2 Yah I'm definitely a 25 year old jailbreaker...
I just downloaded Kanye West and Cradle of Filth's new albums through Safari (SafariDownloadManager)...watched a youtube clip in high wi-fi quality over 3G...and downloaded a 350MB app from the app store without having to wait until I got home to DL via wi-fi (3GUnrestrictor)...
And I love being able to reply to texts without leaving apps, or sliding to unlock, if it's locked (BiteSMS).

Farbod says:

I feel so old at 30...

Farbod says:

@p0sixninja Joshua Hill
GreenPois0n should be updated to support 4.2.1 (tethered or semitethered) within a few days.
This is worst case scenario.

Kristen says:

Wow... Farbod, you make me feel old! :) I'm a 37 yr old jailbreaker, my husband (also JB) is 39 :) Now excuse me while I shuffle off to buy Geritol and watch Matlock. Of course, it's questionable that you young whippersnappers here would get either of those references either so... I'll just be moseying on now... :)

Farbod says:

@Kristen You and your husband rock! ;)

Steve says:

48 yrs and jail break in'
So I can wait on the i4
but will upgrading the iPad compromise mywi functionality?

Farbod says:

@Steve. No. Go ahead. But save ur SHSH on iPad just incase you want to JB it.

hoonaynay says:

Quick question guys: my friend's iPad is still on iOS 3.3 but he's itching to jailbreak it. Does he have to go through all of the steps in saving his SHSH before updating to the newly-release 4.2.1?

Man says:

Is there anyone who can tell me how to jailbreak an iPod Touch 4g 4.2.1 step by step, thank you.