How do you unlock the iPhone 4 4,2.1?
Back up your iPhone data in case the firmware upgrade does not go as planned. Make sure you have the latest version of iTunes installed on your computer. It must be version 7.7 or higher. Launch "WinPwn" using the icon installed on your desktop during setup. When the program opens, click on the "browse.ipsw" button. A window will open. Find the folder where you saved the 2.0 firmware, select it and click "OK."
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