The iPhone dev team just released an update to Ultrasn0w that now supports iOS 4.3.1. The Ultrasn0w 1.2.1 can unlock iPhone 4 and 3GS with the following basebands 01.59.00 (iPhone 4) , 04.26.08, 05.11.07, 05.12.01, 05.13.04, and 06.15.00 (iPhone 3GS). We’ve pushed out the 4.3.1 compatibility fix for ultrasn0w in Cydia — it’s now at [...]