These are step-by-step instructions on how to jailbreak iOS 4.2.1 on iPhone 3GS, iPhone 4, iPad, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G using Greenpois0n for Windows. Tutorial for Mac OS X users is available here. All the steps are the same for all devices, we will cover iPhone.
Greenpois0n has been updated to support the iOS 4.1 and iOS 4.2.1 firmware. Use Limera1n if you want to jailbreak iOS 4.0, iOS 4.0.1, iOS 4.0.2.
Remember: Greenpois0n recommends a clean restore before continuing.
Unlockers: do not update to iOS 4.1 or iOS 4.2.1 if you need the unlock. Ultrasn0w does not support that baseband yet. The only exception is the iPhone 4. Experienced users can also try update to iOS 4.2.1 without upgrading your baseband by using TinyUmbrella. Start TSS Server->Start iTunes->Plug in your iPhone->Restore 4.2.1->Error 1013->Put phone into DFU Mode->Launch Greenpois0n.
We are not authors of this app. We do not promise that everything will go well, use this tutorial at your own risk.
UPDATE: Please, consider reading our Jailbreak & Unlock FAQ, especially if you have questions or troubles.
Step One
Open your web browser and download the latest Windows version of GreenPois0n from here.
The Chronic Dev-Team has released Greenpois0n for Windows which brings an untethered jailbreak to iOS 4.2.1 devices. You can jailbreak iPhone 4, iPhone 3GS, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G, iPad.
You can download the latest version of GreenPois0n from here.
These are step-by-step instructions on how to jailbreak iOS 4.2.1 on iPhone 3GS, iPhone 4, iPad, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G using Greenpois0n for Mac OS X. Tutorial for Windows users is available here. All the steps are the same for all devices, we will cover iPhone.
Greenpois0n has been updated to support the iOS 4.1 and iOS 4.2.1 firmware. Use Limera1n if you want to jailbreak iOS 4.0, iOS 4.0.1, iOS 4.0.2.
Remember: Greenpois0n recommends a clean restore before continuing.
Unlockers: do not update to iOS 4.1 or iOS 4.2.1 if you need the unlock. Ultrasn0w does not support that baseband yet. The only exception is the iPhone 4. Experienced users can also try update to iOS 4.2.1 without upgrading your baseband by using TinyUmbrella. Start TSS Server->Start iTunes->Plug in your iPhone->Restore 4.2.1->Error 1013->Put phone into DFU Mode->Launch Greenpois0n.
We are not authors of this app. We do not promise that everything will go well, use this tutorial at your own risk.
UPDATE: Please, consider reading our Jailbreak & Unlock FAQ, especially if you have questions or troubles.
Step One
Open your web browser and download the latest Mac version of GreenPois0n from here.
The Chronic Dev-Team has finally released the new version of Greenpois0n, which features a full untethered jailbreak for iOS 4.2.1. No SHSH blobs needed. The exploit used has already been patched in iOS 4.3, so it not work on future iOS 4.3.
You can jailbreak iPhone 4, iPhone 3GS, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G, iPad. Unlike redsn0w 0.9.6 this is untethered, so there is no need to connect iOS device to a computer after restart.
There is only Mac OS X version available. Chronic Dev-Team will release Windows and probably Linux version soon.
Unlockers: do not update to stock iOS 4.2.1. You should keep your baseband version. Wait for new version of PwnageTool.
Good news everyone. DevTeam recently posted a tweet where they inform us that they will soon release a new version of Redsn0w utility for Windows. It will be an untethered jailbreak for iOS 4.2.1 using the Monte iOS 4.1 technique.
The Chronic Dev-Team has announced via twitter an untethered jailbreak for iOS 4.2.1. This should work for iPhone 3GS (new bootrom), iPhone 4 and iPad. And it will not require saved iOS 4.2b3 SHSH keys.
The untether is demoed in the video below. It's a result of a collaboration between @0naj, @p0sixninja, and @pod2g. P0sixninja has previously said it will not require iOS 4.2b3 SHSH blobs.
A small bug with wifi still remains. They will release utility as soon as they fix it.
Last week we reported that the well-known hacker Geohot might call his next jailbreak tool rubyra1n. Now guts from Dev Team hit that they know something about Geohot’s effort to bring a proper untethered jailbreak to iOS 4.2.1.
A recent tweet from MuscleNerd confirms the rumors: "I hear geohot does have an untether actually! Though not for all devices".
MuscleNerd from iPhone DevTeam tweeted that an untethered jailbreak solution for iOS 4.2.1 will be released soon, probably next week.
scotty6kids78: @MuscleNerd are we any closer to the unteathered #jailbreak for the new #ios4.2 on #iphone4 ?
MuscleNerd: @scotty6kids78 it’ll be here by Xmas (not because we’re sitting waiting for Xmas, but because it’s achievable deadline)
This untethered solution will be applicable to all current iOS 4.2.1 devices, including iPhone 4, iPhone 3GS, iPad, Apple TV 2G and iPod touch 4G. We will keep you updated.
Currently iOS 4.2.1 jailbreak for iPhone 4, iPhone 3GS new bootrom, iPad, iPod 3G/4G is a tethered jailbreak. That means if you have to reboot your device, it will show a "connect to itunes" logo until you run the jailbreak software again. Musclenerd from iPhone DevTeam has announced that untethered jailbreak for iPhone iOS 4.2.1 is ready. Unfortunately this will be only for those who saved 4.2b3 SHSH keys via Cydia or tinyumbrella.
Got "backup plan" for untethered 4.2.1 JB working (video coming up). Uses mysterious 4.2b3 hashes Cydia kept for you.
"Backup plan" because hacker comex is working on a more extensible jailbreak. We'll keep you up to date with more information as it develops. For now you can watch the proof video:
If you have an iPhone 3GS with the new bootrom you will only be able to perform a tethered jailbreak at this time. This means you will need Redsn0w's assistance to boot into your jailbroken device.
UPDATE: Please, consider reading our Jailbreak & Unlock FAQ, especially if you have questions or troubles.
IMPORTANT FOR UNLOCKERS
During this process you can update your baseband to the 06.15 version. If you are on 05.14 or 05.15 or higher you will need to do this to unlock. You do not need to do this for jailbreak only. Please read the following very carefully before deciding whether to do this.
DevTeam worked hard for the last several hours and released jailbreak tool for iOS 4.2.1. It is redsn0w 0.9.6 b4.
As usual we remind all ultrasn0w unlockers please stay away from this official firmware. Wait for the ability to create custom 4.2.1 IPSWs that don’t update your baseband!
New redsn0w 0.9.6 b4 uses limera1n exploit and will successfully jailbreak all devices. The only problem is that it is a tethered jailbreak, which means you will have to plug it to a computer and rerun redsn0w on every reboot. This so called tethered or semi-tethered jailbreak. This condition applies to iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC model), iPod touch 3G and iPod touch 4G. Hackers are working hard to create untethered jailbreak for these devices. To use future untethered jailbreak you need to save SHSH keys for iOS 4.1 using TinyUmbrella utility or directly in Cydia.
Old devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (non-MC model) can be jailbroken-untethered right now using this latest version of RedSn0w.
Geohot, the famous iPhone hacker and the creator of different jailbreak and unlock utilities (purplera1n, blackra1n and blacksn0w), is now working on a new jailbreak utility. It will support untethered jailbreak for all devices with the latest bootrom and the latest firmware. This includes iPhone 3GS and iPod Touch 3G.
Here is what Geohot writes in his blog:
The jailbreak is all software based, and is as simple to use as blackra1n. It is completely untethered, works on all current tethered models(ipt2, 3gs, ipt3), and will probably work on iPad too.
Don't ask about a release date. You won't make it happen any sooner.
It is still unclear if he used one of the recent iPhone Safari hacks to gain control of the device or if this is something else.
A few hours ago we wrote about new group of hackers who claimed to have found a new exploit for the iPhone 3GS and iPod Touch with new iBoot. With this Gull1Hack utility you should be able to perform the untethered Jailbreak even on new devices. Here is a new demo video:
Sn0wBreeze 2.9.6(pwnagetool for windows, supports untethered jailbreak of iOS 5.1.1 for iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G, iPad and Apple TV 2G)
Sn0wBreeze 2.9.3(pwnagetool for windows, supports tethered jailbreak of iOS 5.1 for iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G, iPad; untethered for iPhone 3GS with old bootrom; untethered for iOS 5.0.1, iOS 4, iOS 3 supports Apple TV 2G)
Sn0wBreeze 2.8b11(pwnagetool for windows, supports iOS 5, iOS 5.0.1, tethered jailbreak for iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G, iPad, Apple TV 2G; untethered for iPhone 3GS with old bootrom)
Current version is ultrasn0w 1.2.3, download in Cydia (unlock for iPhone 4, iPhone 3GS, iPhone 3G, firmwares 3.0-4.3.3; it supports basebands 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00)