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Ultrasn0w
The first iPhone 3G unlock. Released on 01/01/09. [1]
A demo (of a console-only version of the app though) can be seen at http://qik.com/video/729275.
Contents
Credit
Exploit
Relies on an unsigned code exploit.
The actual unlock works by a daemon patching the baseband's RAM on-the-fly, overriding the carrier lock code. It is not permanent because of the signature checks - the bootloader has to pass the sigchecks and the baseband has to pass them too, so any change to the baseband/bootloader cannot be made.
(Currently there's no any further information)
