Some of you will have already heard about the dreaded Error 53 issue on iPhones with Touch ID and iOS 9 installed. If you don’t, what happens is, if your screen or home button is damaged and you get them replaced through a non-Apple repair shop, the next time you update your phone it is disabled. This is to do with a security feature related to the Touch ID which stores very sensitive information that can be dangerous in the wrong hands. The only way to successfully replace a damaged screen or home button without bricking your phone was via the Apple Store.
Apple have released an iOS update to resolve this issue, in a statement issued to TechCrunch Apple apologise and state that this unintended functionality was part of their testing process and disabling iPhones after third party repair was not their intention. The update will revive any disabled iPhones and must be done via iTunes on your computer. Make sure that you have the latest version of iTunes. Connection your phone to your computer via the Lightning cable, try a force restart and restore your iPhone. This should bring your phone back to life but note that Touch ID will still be disabled for security. To enable this you need to get a repair done at an Apple Store. More details on how to update your phone are on the Apple Support website.