Apple has rolled out a fix to the "Error 53" that has bricked some iPhones and also apologized for the occurrence. The Error 53 is said to occur when you repair the home button on the iPhone 6 or iPhone 6 plus at any repair outlet that is not authorized by Apple.
Although the phone might work after the repair but the problem begins the moment you try to update the iOS with a newer version, which will definitely cause the software to check if the Touch ID sensor matches the rest of the hardware. If you have repaired the touch sensor else where, the touch sensor won't match the hardware and this will cause your iPhone to stop functioning.
The Good news is that Apple has rolled out an updated version of the iOS 9.2.1 on iTunes to handle this error, fix bricked phones and prevent possible bricking of iPhones as a result of unofficial Apple repairs.
So, if you have an iPhone that was bricked by Error 53, connect it to your iTunes and run the updated iOS 9.2.1 to bring the iPhone back to life.
Moreover, you may still need to let an Apple authorized repairer work on the touch sensor because the fix may restore your phone but the Touch ID will not work so far the Touch ID and hardware pairing is still negative due to unauthorized repair.
Apple has also released a statement on this issue saying;
"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."
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