Here are our step-by-step tutorials that will guide you through all the process of untether jailbreaking iOS 5.1.1 with absinthe, redsn0w and sn0wbreeze:
iPhone 4S
UnTethered jailbreak iOS 5.1.1
iPhone 4
UnTethered jailbreak iOS 5.1.1
The Chronic Dev Team has released Greenpois0n RC6.1, a new version of their ‘untethered’ iOS 4.2.1 jailbreak tool which now includes an update that disables Apple’s means of protecting the iBooks application from jailbreakers.
Recent Greenpois0n changelog:
Greenpois0n RC6.1 supports iPod Touch 2G, iPod Touch 3G, iPod Touch 4G, iPad, iPhone 3GS, iPhone 4, Verizon iPhone 4 (iOS 4.2.6) and Apple TV 2G.
You can download the latest Greenpois0n RC6.1 .
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.
Today the Chronic Dev-Team released their jailbreak utility called Greenpois0n. There are currently two versions – for Windows and for Linux users. The team is working on a Mac version, so it will be released soon. Greenpois0n supports only firmware iOS 4.1, so use Limera1n if you want to jailbreak iOS 4.0, iOS 4.0.1 or iOS 4.0.2.
Remember: Do not update to iOS 4.1 if you need the unlock. Ultrasn0w does not support that baseband yet.
Hackers used the bootrom exploit found by Geohot and used in limera1n.