Apple has finally addressed and issued a fix for Error 53, a "safety"
mechanism that would prevent your iPhone from booting if you had certain
repairs done outside of Apple's official channels.
Essentially, if you had a repair done to fix a broken Touch ID on your
iPhone 6, 6 Plus, 6S, or 6S Plus, or a screen fix that required
disconnecting Touch ID, your iPhone was effectively bricked unless you
had Apple or an Apple certified repair technician do the repair.
