If you see error 53 or can‘t update or restore your iPhone or iPad
Follow these steps to get help updating or restoring your iPhone or iPad.
If your iOS device has Touch ID, iOS checks that the Touch ID sensor matches your device’s other components during an update or restore. This check keeps your device and the iOS features related to Touch ID secure.
When iOS finds an unidentified or unexpected Touch ID module, the check fails. For example, an unauthorized or faulty screen replacement could cause the check to fail.
If the check on Touch ID fails, your update won’t finish. You’ll see a Connect to iTunes screen on your device or a message like this in iTunes on your computer: The iPhone [device name] could not be restored. An unknown error occurred (53).
Follow these steps
If you got your screen or other parts replaced
If the screen on your iPhone or iPad was replaced at an Apple Service Center, Apple Store, or Apple Authorized Service Provider, contact Apple Support. If the screen or any other part on your iPhone or iPad was replaced somewhere else, contact Apple Support about pricing information for out-of-warranty repairs.