Apple on Friday publicly acknowledged an unusual "Error 53" message, triggered by updating an iPhone 6 to iOS 9 or later after having the phone’s Touch ID sensor fixed by an unofficial technician.
AppleInsider – Frontpage News
Apple Day – Apple, iPod, iPad, iPhone, iTouch, iMac, iBook
Apple Day – Apple, iPod, iPad, iPhone, iTouch, iMac, iBook