Insert your tweezers into the small opening to the right of the ribbon cable and peel up the right side.

Insert your tweezers into the small opening to the left of the ribbon cable and peel up the left side.

Once both sides are peeled up, gently pull the ribbon cable up with your fingers to release it from the adhesive holding it to the frame.

With both sides and the contact pads released, you should be able to pull the ribbon cable away from the frame of the phone with no further issues.

After fully removing the side buttons ribbon cable, install it onto the new screen and frame.