Apple Releases Updated Version of iOS 9.2.1 to Fix ‘Error 53’

Apple today released an updated version of iOS 9.2.1, which is designed to fix devices that have been affected by error 53, an issue that could ‘brick’ a user’s iOS device if it received a third-party Touch ID sensor replacement instead of one of Apple’s own replacements.

Non-matching repair components that affected the Touch ID fingerprint sensor caused an iOS device to fail a Touch ID validation check because the mismatched parts were unable to properly sync. The validation check occurred during an iOS update or restore, and when failed, Apple disabled the iPhone, effectively “bricking” it in an effort to protect Touch ID and the related Secure Enclave that stores customer fingerprint information.


Apple originally explained that error 53 was intentional, implemented as a way to prevent the use of a malicious Touch ID sensor that could be used to gain access to the Secure Enclave, but customers with bricked devices were not happy with the explanation and Apple found itself facing a class-action lawsuit.

iOS 9.2.1 is the current firmware for iOS devices, and it has been the current firmware for the past month; however, last month’s iOS 9.2.1 release came with the build number 13D15 and Thursday’s iOS 9.2.1 release comes with the build number 13D20.

iOS 9.2.1 build 13D20 is a firmware that users can restore to via iTunes if they’ve ‘bricked’ their devices by having a third-party Touch ID sensor installed. The firmware is not available as an OTA (over-the-air) update, but instead, must be installed via iTunes on your computer, which makes sense because you would not be able to get to an OTA state on a bricked device anyhow.

Users that have not had a third-party Touch ID sensor installed need not worry about installing the update.

Alongside the new version of iOS 9.2.1, Apple has also published a support document outlining how customers can resolve the “error 53” problem, and it has issued an apology, shared by TechCrunch.

“Some customers’ devices are showing ‘Connect to iTunes’ after attempting an iOS update or a restore from iTunes on a Mac or PC. This reports as an Error 53 in iTunes and appears when a device fails a security test. This test was designed to check whether Touch ID works properly before the device leaves the factory.

Today, Apple released a software update that allows customers who have encountered this error message to successfully restore their device using iTunes on a Mac or PC.

We apologize for any inconvenience, this was designed to be a factory test and was not intended to affect customers. Customers who paid for an out-of-warranty replacement of their device based on this issue should contact AppleCare about a reimbursement.”

The updated version of iOS 9.2.1 is available through iTunes and is not designed for customers who update their devices over the air. It can be downloaded on the iPhone 6, 6s, 6 Plus, 6s Plus, iPad mini 3, iPad mini 4, iPad Air 2, and iPad Pro.

Apple Releases Updated Version of iOS 9.2.1 to Fix ‘Error 53’

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