Unlock 4.3.1 - Ultrasn0w 1.2.1 Unlock iPhone 4 / 3GS [ Few Hours]

Dev-team will release ultrasn0w 1.2.1 within few hours, MuscleNerd has just showed us a screen-shot of ultrasn0w 1.2.1
which brings support for iOS 4.3.1 jailbroken iPhone 4, 3GS with the old basebands (Check the unlockable basebands at the end). Some users has 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, 06.15.00, and 01.59.00).