My iPhone 6 downloaded iOS 9.2.1. It will not install. I read that I should connect phone to computer and update through iTunes. That did not work at all. I now have a phone that does not work. Won't even turn on
Are you getting an error message?
Yes but I don't remember. Maybe 53 or 83. It has to do with Touch ID.
Has your iPhone ever been repaired for Touch ID issues? Seems like that error is a hardware error and has affected people attempting to upgrade iOS based on the few articles I read associated with that error (53). If you are still under warranty you may need to contact Apple if further attempts to update won't allow you to move forward.
No it has never been repaired.
Contact Apple if you still have the 90 days free phone assistance (assistance over the phone).
Or you can try this: Press the power and volume up button at the same time and keep them pressed until the phone reboots and starts again.