The iPhone Dev Team, Chronic Dev Team, and pod2g collaborated to release Absinthe in January 2012, a desktop-based tool to jailbreak the iPhone 4S for the first time and the iPad 2 for the second time, on iOS 5.0.1 for both devices and also iOS 5.0 for iPhone 4S.
In May 2012 they have released Absinthe 2.0, which can jailbreak iOS 5.1.1 untethered on all iPhone, iPad, and iPod touch models that support iOS 5.1.1, including jailbreaking the third-generation iPad for the first time. Below you will find a full Windows tutorial on how to perform the Absinthe jailbreak:
Probably the most important step, always, be sure to backup your data before jailbreaking or restoring.
Download Absinthe 2.0.4 by clicking this link.
Unpack the downloaded file and run the executable. If need be, right click on the executable and select “Run as administrator”.
Before connection your iDevice to your computer, you’ll have to temporary remove your passcode lock. After you have successfully removed the passcode lock, connect your device to your computer running Absinthe and ensure that Absinthe detects the exact device that you connect. You’ll need to unlock your device – so that you’re on the homescreen.
All you have to do now is to click the Jailbreak button, and let the process complete. You will see your iPhone act as if it’s performing a restore, this is normal, be patient.
Once complete, you should receive an alert on Absinthe telling you that the jailbreak is complete, and you should see the Cydia app icon on your Home screen. It is now safe to unplug your device.
Open Cydia, and it will prepare for first use. Congratulations, your iOS device is now jailbroken with an untethered jailbreak!
Don’t forget to set back the passcode lock if you removed it in step 3.
Here’s a video tutorial on how to jailbreak your iDevice with Absinthe on Windows: