Jailbreak iPhone, iPod Touch, iPad

UPDate: save your iOS 4.2.1 SHSH blobs now!

UPDate 2: Attention! We’ve received info, that Apple stopped signing iOS 4.2 for devices for which iOS 4.3 is available. This means you will not be able to restore to 4.2.1 without saved SHSH keys.

Using this tutorial you will be able to jailbreak iOS 4.2.1 running on iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 3G, iPod Touch 4G and iPad. Pwnagetool will also preserve baseband version if you need carrier unlock. If you have updated the baseband to version 06.15, you can use this tutorial. This tutorial uses PwnageTool 4.2 for Mac OS X.

We are not developers of jailbreak utilities, so we cannot assure that everything will work just fine. However we tried this tutorial on several devices and succeeded.

We will use iPhone 4 in our jailbreak tutorial. The process is the same for all devices.

Step One
Make a folder called “Pwnage” on the desktop. Download a couple of things:

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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 and Apple TV 2G. 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.

You can download GreenPois0n RC5 from here.

UPDATE: Step-by-step tutorial