My Touch ID does on iPhone 6 not work after iOS 8.1.2 update

Delete it and rescan it.

Cheers,

GB

In this case, you're supposed to restore your iPhone:Use iTunes to restore your iOS device to factory settings - Apple Support

The troubleshooting steps do not recommend restoring the device to fix Touch ID issues:

Use Touch ID on iPhone and iPad - Apple Support

(see the "Get Help with Touch ID" section).

GB

same problem here !! Touch ID is not reading perfectly after 8.1.2

i'm do almost every thing but when my iphone is 8.1 it's amazing in reading finger print