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I have the latest 4.0.2 (8A400) firmware and tried using redsn0w beta 5 to unlock it but it says "Firmware not recognized". I tried previous 4.0.x firmware files also with the same problem. Any ideas how to unlock the phone with iOS4? None of the instructions on the internet seem to work.
Is the only alternative to downgrade to 3.1 and then unlock it?