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:
UnTethered jailbreak iOS 5.1.1
The iPhone Dev-Team has released UltraSn0w 1.25 which brings iOS 5.0.1 support to the unlock for older compartible basebands.
iPhone Dev Team’s iPhone 4, 3G, and 3GS software unlock, now with added PwnApple. Compatible with iPhone 4 baseband 01.59.00 and iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00! Thanks to @sherif_hashim and @Oranav for contributing baseband crashes
If you have one of the supported basebands and wish to update to iOS 5.0.1 you will need to do so with a custom ipsw that doesn’t update your baseband.
Indeed DevTeam have not updated software unlock utility ultrasn0w to work with the latest iOS 5.0.1. There are two workarounds, that will make ultrasn0w work on 5.0.1.
Ultrasn0w was updated to support old baseband on new iOS 4.3.3.
Here is the list of supported basebands:
You can update to iOS 4.3.3 and preserve old baseband using two utilities. Here are step-by-step instructions:
PwnageTool 184.108.40.206 (Mac OS)
Sn0wBreeze 2.7.3 (Windows)