Ultrasn0w 1.2.1 To Unlock iPhone 4 And iPhone 3GS On iOS 4.3.1 Will Be Released Over Few Hours

Dev-team will launch ultrasn0w 1.2.1 with in few hours, MuscleNerd has showed us a screen-shot of ultrasn0w 1.2.1 which brings support for  iOS4.3.1
jailbroken iPhone 4, 3GS with the old basebands [Check the unlockable basebands at the end]. Some users used ultrasn0w fixer but still have some bugs as they noticed a single signal bar.

Ultrasn0w 1.2.1 fix all these bugs. But you have to know that ultrasn0w 1.2.1 isn't a new unlock, it will allow users to unlock iPhone 4, 3GS on these basebands only (04.26.08, 05.11.07, 05.12.01, 05.13.04, 01.59.00, and 06.15.00).

So who relies on ultrasn0w unlock and want to jailbreak his device on iOS 4.3.1, he MUST use PwnageTool 4.3 (Mac) or Sn0wbreeze 2.5 (Windows) to preserve their unlockable baseband [Click Here to know how to update you iOS 4.3.1 with preserving old baseband] while upgrading to iOS 4.3.1.