The following steps explain how to put an Apple iPhone into Force Recovery (DFU) to perform a factory restore.
Note: Performing the restore after putting the device into recovery mode may delete all user data if a backup has not been done previously.
- Turn off the iPhone.
- Launch and check if you have the latest version of iTunes.
- Go to Help.
- Check for Updates.
- Press and hold the Home button while connecting the iPhone to the computer with the USB cable.
- Release the Home button when iTunes prompts with a message indicating that a device in recovery mode has been detected.
- The device is now in recovery mode; you may restore from a backup or set up as a new iPhone.