What Is iPhone Error 53 and How Do You Fix It?

A humorous illustration of a frustrated men looking at a phone with a skull on its screen

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IPhone error 53 is a somewhat obscure problem that can cause your iPhone to not work at all. Given that error 53 is not widely known and can have drastic consequences, it's important to understand what it is, what causes it, and how to avoid it.

Who Is At Risk for iPhone Error 53?

According to most reports, error 53 strikes people who:

In theory, error 53 could also affect iPhone 5S or later models, but we haven't seen reports of that.

What Causes iPhone Error 53

Apple's page that explains iPhone and iTunes error codes lumps 53 in with a couple dozen other hardware problems and provides some generic suggestions. But if you poke around Apple's support site, there is a page devoted specifically to error 53.

The current version of the page doesn't provide a very useful explanation for what causes error 53, but an older version of the page used to say:

"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."

The important part is that the Touch ID fingerprint sensor is matched to the other hardware components of that device, such as the motherboard or cable that connects the Touch ID sensor to the motherboard. It's not a surprise that Apple prefers that only Apple parts are used in an iPhone, but the idea that the parts are aware of and dependent on each other is interesting.

It makes sense that Apple would implement strict security around Touch ID. After all, Touch ID uses your fingerprint, a crucial piece of personally identifiable information that could be used for mayhem like identity theft. It's also used to secure both your iPhone and Apple Pay. An iPhone whose Touch ID unit doesn't match the rest of its hardware could have been tampered with, opening it up to attack.

Since the components of your iPhone are aware of each other, getting a repair with components that don't match can cause iPhone error 53. For example, you might think you can repair a cracked screen or a broken Home button with any compatible part. But Apple is saying that you could get the error if those parts don't all match — which is something most third-party repair shops probably can't know. 

Some experts who analyzed Error 53 dispute the idea that it's strictly a security measure.

If you're seeing error 53, it's most likely because you had a repair done using parts that don't match each other.

How to Avoid iPhone Error 53

It's well known that Apple is very strict with its warranties. Any repair made to an iPhone by anyone other than Apple or an authorized third-party repair provider will void that warranty. To avoid a problem with your warranty and error 53, always make sure to get repairs from Apple or an authorized provider.

Apple Fixed iPhone Error 53 in iOS 9.2.1​

Apparently in response to public outcry over the issue, Apple released iOS 9.2.1. This update allows people whose phones have been hit with error 53 to restore them on their own, without contacting Apple or paying Apple for repairs.

If you're already running iOS 9.2.1, there's nothing for you to do. If you try to restore an iPhone bricked by error 53 to iOS 9.2.1, the new version will be downloaded from Apple and the restore process will now work. This same fix should apply to all future versions of the iOS, as well.