On the second cable, loosen the entire connector board, not the little ribbon cable. I did just the cable, and was unable to get the cable to stick in place when putting it back together. This cable is for the power and volume buttons.

Mine were T4. Unfortunately, the T3 worked for most screws, but stripped the really tight ones.

The screws are T4, not T3.

T3 will engage and unscrew if it’s loose enough, but if the screw is tight, all you will do is strip it out. Ask me how I found this out. Go ahead, ask.