- 1). Open iTunes and connect the running iPhone to your computer using a USB cable.
- 2). Turn the iPhone off and enter DFU mode. To enter DFU mode, simultaneously press and hold the "Top" and "Home" buttons for 10 seconds; release the "Top" button and continue holding the "Home" button until iTunes recognizes the iPhone in recovery mode.
- 3). Right-click on "Restore" on the iPhone screen in iTunes to search for the custom firmware file originally used to unlock the iPhone. For example, an unlocked iPhone 3G running OS 3 would use a file titled, "iPhone1,2_3.0_7A341_Custom_Restore.ipsw". Select the custom firmware file and click "Choose." iTunes will restore the iPhone. Do not interrupt the restoration process.
- 4). Select the desired backup from the dropdown menu and click the "Continue" button to restore the iPhone. iTunes will offer to restore the iPhone with the most recent backup of user data. Once restoration is complete, the iPhone is ready for use.
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