This is a number that we can observe when restoring your mobile device.
Updating the iOS of your mobile device can become a routine activity where there should be no inconvenience.
If you try to update or restore your iPhone or iPad with macOS Catalina 10.15 or later in the Finder, or on macOS Mojave 10.14 or earlier, or a PC with iTunes, you might see error 53 on your computer.
If this number appears on your screen, you must do this step by step indicated on Apple’s website:
Steps to follow
Make sure your Mac has the latest software updates. If you use iTunes, make sure the device has the latest version of iTunes.
Connect the device to your computer with a USB cable.
Find the device on your computer.
When you see the Restore or Update options, click Update. The computer will try to reinstall the software and restore the device without erasing your data.
If you cannot move past the screen displaying the Apple logo, force restart2 your device. When you see the Restore and Update options, click Restore.
– When you see the greeting screen on the device, follow the steps that appear to set up the device.
– If you had made a backup of the device, you can configure it from said backup.
When you see the Touch ID screen, tap Set up Touch ID later.
If Touch ID wasn’t working on your device before you saw error 53, it will still not work after you’ve updated or restored your device. Contact Apple Support for information on Touch ID-related service options.
If you get error 53 when installing iOS 9.3 or later, make sure the computer can communicate with Apple’s servers or try another computer.