You have to use both *the original home button* and *the original home button ribbon cable* to get the finger ID feature to work. The original cable is attached to the back of the face of the phone with very strong adhesive. So you have to use a heat gun or blow dryer and a small pry tool to pry it up. There’s a small, undetectable metal plate attached to the end of that cable. Be careful not to rip the cable from the metal plate that’s attached to it. Again, you can’t see it until after you’ve pryed the cable up. Good luck.