iPhone 5s Home Button Replacement
Step 9 - Replace the Home button flex
Remove the top right screw holding the Touch ID cable in place using your screwdriver. There is a tiny metal guard underneath, make sure you hold it in place so the cable doesn't spin or tear underneath it. Also make note of the orientation of this guard as you'll need to replace it again during re-assembly. Once you've gotten the top screw out and set that and the guard aside, you can fold back part of the Touch ID cable in order to remove the two screws holding in the shield that sits above the Home button. Again, use your screwdriver.