Re:Five States Are Considering Bills to Legalize the 'Right ...
by manicdee on Monday January 23, 2017 @08:29PM
(#13468061)
Here is one article I found, the basic claim is that the Touch ID sensor is (cryptographically?) paired to the secure enclave and replacing it requires Apple magic sauce to revslidste the sensor/enclave pairing.
https://9to5mac.com/2016/02/05/error-53-iphone-6/