Redsn0w 0.9.12b1 Jailbreak Tutorial (backup/restore method)
This is a tutorial for jailbreaking the iPhone4, iPhone4S, iPad2 and iPad3 using the new Redsn0w 0.9.12b1 release backup/restore method. Redsn0w uses the same backup/restore jailbreak method that is used by Absinthe 2.0.4. This is for an untethered jailbreak on 5.1.1 only, if you are on 5.1 you will have to update before proceeding.
Step 2: With your device connected, open up Redsn0w and click the jailbreak button.
Step 3: Once you hit jailbreak, Redsn0w does everything else automatically for you. Once you hit jailbreak Redsn0w will prepare the jailbreak files, process the fake restore and complete the jailbreak.
Step 4: After the Redsn0w process finishes, follow the on-screen instructions which tell you to wait for the device to reboot. After the device reboots initially, it will reboot again, make sure not to touch anything on your device during this time. Once the phone reboots again you will have Cydia installed on your springboard and you are now successfully jailbroken!