As promised, the iPhone Dev Team has finally released an updated version of Ultrasn0w which fully supports iOS 4.3.1.

Ultrasn0w-1.2.1

Keep in mind that the updated version of Ultrasn0w only unlocks the iPhone 4 and iPhone 3GS running older basebands on iOS 4.3.1. If you’ve already upgraded your baseband, then trust me, you just pwned yourself. Head over to Redmond Pie for a complete step by step tutorial on how to unlock your iPhone 4 and iPhone 3GS running iOS 4.3.1 running a preserved baseband.

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