Failed - Unable to complete touch ID Setup
What to do when Touch ID won’t work after Screen Replacement? i tried to reinstall iOS, but still won’t work.
The original button has to be transplanted over to the new screen if its transplanted over and nothing is damaged ie the long home button flex under the screen and the home button itself then you shouldnt loose touch id. If u booted the phone without the home button to try the screen then touchid wont work till u restart the phone again.
If it doesn't work after a screen then u really did damage something either on the flexes or on the board itself u need to inspect carefully
Restoring, resetting etc will not help and is pure nonsense
A new home button original or copy made out of gold or chinesium will never work no matter what u do unless it is done by apple anyone that tells u otherwise is wrong, the only hope for touchid is the original button which was with the phone and paired with the cpu if its damaged the only way to get it to work is to try ur best to fix .
It is the fingerprint sensor that is paired to the home button so for Touch ID you must keep the same home button. The JerryRig Everything YouTube series: IPhone 6 display replacement, shows the process in good detail. I have followed those tutorials and they are excellent. Good luck.