Apple has released an update for iOS 9.2.1 that fixes the "
Error 53" bug that recently became a major problem for some users after repairing their Touch ID-equipped devices via unofficial means, leaving the iPhones non-functional and unrepairable. The updated version of iOS 9.2.1 is able to restore the "bricked" iPhones, with Apple also issuing an apology to affected users, as well as offering reimbursement to some users who ended up paying for out-of-warranty replacements of their devices.
According to the
support page, the update takes place via iTunes, with users needing to force restart and then restore their devices to carry out the fix. Users who usually perform over-the-air updates via iCloud are unaffected, and the fix does not apply to them.
A statement from Apple issued to
TechCrunch advises the Error 53 code was designed to check "whether Touch ID works properly before the device leaves the factory," with the update preventing the error from appearing again. "We apologize for any inconvenience; this was designed to be a factory test, and was not intended to affect customers," writes Apple, before suggesting that customers "who paid for an out-of-warranty replacement of their device based on this issue should contact AppleCare for reimbursement."
While the update does revive an iPhone from being bricked, it will not re-enable Touch ID sensors if they were replaced as part of a third-party repair. This is due to the need to keep the Secure Enclave as safe as possible, and replacement parts from an unknown source could pose a security risk if it is allowed to access the data.
Customers who saw the error after a repair by an Apple Store, Service Center, or Authroized Service Provider are asked to contact Apple Support for a presumably-free or low-cost fix. Those affected following a third-party repair or one performed themselves are also advised to contact Apple Support "about pricing information for out-of-warranty repairs."