For those of you who updated your unlocked iPhone 4 or iPhone 3GS to the iOS 5.1.1 firmware and are Jailbroken tethered you were probably in for a shock when UltraSn0w was not able to be installed. This is because the iPhone Dev-Team need to update UltraSn0w to be compatible with the iOS 5.1.1 firmware. Luckily for you however, a temporary solution was released called UltraSn0w Fixer for 5.1.1 that can unlock the iPhone 4 and iPhone 3GS on the following basebands — 01.59.00, 04.26.08, 05.11.07, 05.13.01, 05.12.01, 06.15.00.
If you would like to unlock your iPhone on the iOS 5.1.1 firmware with UltraSn0w Fixer for 5.1.1 you will simply need to add the 3rd party repository shown below. For those of you who do not know how to add a new repository into Cydia you will simply need to go into the Manage tab, Sources section, and then click the edit, followed by the add button.
A more in-depth guide to unlocking your iPhone 4 or iPhone 3GS running the iOS 5.1.1 firmware with UltraSn0w Fixer for 5.1.1 will be coming your way soon. Until that time please stay tuned and leave any questions or thoughts about this temporary fix in the comments section below.
Update #1: The how to guide for unlocking your iPhone 4 or iPhone 3GS with UltraSn0w Fixer for 5.1.1 has been published (click here for more information).