iOS 9.2.1 13D20 for iPhone with Touch ID Released to Fix Error 53
Apple has released a revisional software update for iOS 9.2.1 for iPhone devices with Touch ID sensors. The new build arrives as 13D20 (as opposed to 13D15 build of iOS 9.2.1 for all other devices) and aims to resolve an “Error 53” software issue where certain iPhone models with a broken or replaced Touch ID sensor would become inoperable, displaying the error 53 message in iTunes.