Remove the inner back cover by unscrewing all three T6 screws (circled in Picture 1) with a T6 Torx screwdriver.

The inner back cover, removed in the next bullet, can be difficult to remove. You may need to use a plastic opening tool. Insert the plastic tool near the top of the phone between the cover and the phone. Gently pry the cover off.

Pull the inner back cover from the bottom towards you and up (Picture 2).