The guide below will help you to perform untethered iOS 5.1.1 jailbreak with Sn0wbreeze 2.9.5 over iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G and original iPad.
Note: Sn0wbreeze 2.9.5 does not work for A5 devices like iPhone 4S, iPad 2, and iPad 3 (New iPad).
Jailbreak iOS 5.1.1 with Sn0wbreeze 2.9.5
Unzip download Sn0wbreeze zip and run Sn0wbreeze.exe file
Click “OK” > “Next” arrow button on screen
Click on “Browse for an IPSW”, and navigate to select downloaded iOS 5.1.1 file from your system
Sn0wbreeze do some process to verify and recognize provided IPSW file, on completion click Next arrow button
Click on “Expert Mode” > “General” and click Next arrow button
Note: Here select the box for “Activate the iPhone [Hactivate]” in case you are not using official carrier SIM and then go next and next by clicking on arrow buttons
Click “Build IPSW” and go next
Sn0wbreeze starts process to build custom iOS 5.1.1 firmware which may take few minutes, so during that you can play integrated PacMan game to kill your time, as an option
Done! message will display on process completion, so click OK button there
Follow Sn0wbreeze instructions to put your iDevice into Pwned DFU Mode
When your iDevice will successfully get entered into Pwned DFU Mode, iTunes pop-up and starts custom iOS 5.1.1 firmware restore on your iDevice that’s just created by Sn0wbreeze in step-8
Enjoy, your iDevice is now running over untethered jailbroken iOS 5.1.1.