The iPhone Dev Team has released, new version of Redsn0w jailbreak tool, and now it is on 0.9.12b1 version with added support of untethered 5.1.1 jailbreak. So with Redsn0w 0.9.12b1 version only works with A4 Devices and below A4 Devices.
Here are the full Devices lists for Redsn0w 0.9.12b1 untethered 5.1.1 jailbreak.
iPod Touch4G/iPod Touch3G
Redsn0w 0.9.12b1 is supporting Both Windows and Mac. So before start Redsn0w jailbreak process, you have to take below necessary action.
Redsn0w 0.9.12b1 is a supports untethered jailbreak.
Please make sure your Device should be compatible with iOS 5.1.1 version.
Please backup all your data before a start jailbreak process.
Make sure you should run iTunes latest.
Those are very important, once you take necessary action regarding above. You are allowed to jailbreak your iPad1 using Redsn0w 0.9.12b1 version.
How to jailbreak iPad1 using redsn0w 0.9.12b1?
Download file should be save on your Desktop folder and folder should named Redsn0w
Make double click on Zip file of Redsn0w for extract. Now launch the application.
Windows users should run as Administrator.
Now click jailbreak button
Now Redsn0w is starting jailbreak process with below following steps.
After finish above following three steps, Redsn0w will inform to you, and your iPad1 is jailbroken. Now let alone your iPad1 because it will reboot. After finish reboot, your iPad1 respring. Once finish respring, your iPad will successfully jailbroken and Cydia will be your iPad home screen.