Dev-Team Releases First iPhone iOS 4.2.1 Jailbreak

Just one day after Apple's release of the iOS 4.2 firmware update, iPhone Dev-Team has made public the first updated jailbreaking tool for Mac OS X and Windows. Redsn0w version 0.9.6b4 can be used immediately for those who are not concerned about using the ultrasn0w unlock. iPhone 3G and older iPhone 3GS users will be happy to know that the jailbreak is untethered.

apple iphone iOS 4.2.1 jailbreak redsn0w logo

For newer iPhone 3GS and iPhone 4 users, this version currently requires a computer to boot into the jailbroken state. The iPhone Dev-Team is working with @comex on a fix that would untether the iPhone 4 jailbreak once and for all. Unlockers can expect a new version of ultrasn0w for the iPhone 3G and iPhone 3GS as early as next week.

First and foremost, never update using an official firmware file via iTunes if you're interested in unlocking. Secondly, make sure to save your SHSH blobs to preserve future jailbreak and unlock options. Dev-Team would not say how long it might take to untether the iPhone 4 iOS 4.2.1 jailbreak, but work is underway.

All recent iOS devices can be jailbroken thanks to a combination of past exploits including pwnage2, arm7_go, 24kpwn, and geohot's limera1n. The current jailbreak solution will work until Apple updates the iPhone hardware. Make sure you get the official, free redsn0w for your platform directly from iPhone Dev-Team. If you can't stand the thought of a tethered jailbreak, be patient. We'll break the news as soon as Dev-Team releases the latest tools.


No unlock of after new year. If you guys a are waiting then just keep waiting.

Iphone fantastic.
I have a Iphoen, I need it work business.
but I think it a lot of application, sometime dont need.

The Dev-Team is amazing! In about 24 hours they have already put out the tethered JB. I give them less than 2 weeks to have the tethered JB! Be patient and these guys will come thru! A big thank you from me to the Dev-Team!

do we have an approximate time estimate on when the unlock of version 4.1 will be available?

and just to clarify if i have 4.1, should i update to 4.2 or is the unlock going to require 4.1.


I have a iphone 3G(S) on baseband 05.13.04, jailbroken and unlocked on ios 4.0.1
Can I(rather should I ?) upgrade to 4.2 or 4.2.1 and if yes, how ?

You guys all need to put your iphones away and take a course in writing English! I know most, if not all are GPA 1.5 dropouts, but you really need to jailbreak a GOOD auto-speller and thesaurus to make up for all your inadequacies. Lets all dumb down the rest of our society (if there is any left that hasn't been).

and you my friend need a good app to teach you some manners on how to talk to others in public. I think you're a KG drop out. You need to watch Sesame Street again. :P

You took the word's right out of my mouth. You beat me to it.

Did it occur to you that English might not be their first language?
Oh and you usually don't need a comma when 'but' follows, it is a conjunctive word. I guess an auto-speller might not pick that up. x

i totally agree with your english-maybe-not-1st-language comment, but a comma always precedes 'but' when it is followed by an independent clause which IS the case in this sentence as well as the one you commented on. so, the sentence was actually correct. also, i'm typing in all lower-case letters intentionally, so no need to comment on that after you read this.

motherfucker, dont bullshit me.