Question: When I plug my iPhone into the computer, iTunes shows the error 53. I have only tried to restore the iOS firmware (downgrade from iOS 9 to iOS 8.4) but iTunes wouldn’t let me do it. Instead, it throws the error 53 on the screen and now the iPhone is blank. How do I fix this?
Error message 53 appears because of the hardware fault in your iPhone or iPad. If you have a broken screen or any issues with TouchID / Home button with your iOS device, then iTunes shows you this 53 error.
Now, you can still use the devices even with a broken screen or TouchID issues. You can charge, sync vids, songs, etc. All this without any problems. But the minute you start upgrading or downgrading the iOS firmware? Apple iTunes will scan for any faults.
If it believes there is any fault and the issue is critical, then the error 53 is thrown at you.
Solution to this is to talk to Apple – if you are know there is a hardware failure.
If you don’t think your device has any hardware failures or TouchID sensor issues, then you can retry the whole installation process once again. Unplug the device, reboot your computer, and try again.
In the past, Apple representative said that error 53 simply means you have a broken, dead iOS device. Note that if you have replaced any part of the device with a duplicate or similar part from a local repair center, there is a chance you might get the error 53.
In short: Error 53 is a hard pill to swallow, and in such cases, there is nothing you can do apart from trying to restore iOS firmware once again or take the device to the nearest Apple store.