how to unlock iOS 4.2.1 with Ultrasn0w 1.2 [Video Guide]

The iPhone Dev-group has launched the up to date version of service unlocking device referred to as Ultrasn0w which will release the latest iOS 4.2.1 and 4.1 firmware on iPhone 3GS and 3G on basebands later than 05.13.04. considering that iPhone four has completely different baseband OS, it’ll take a short while longer for the Dev team to release it on the latest firmware.

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