Press and hold the battery release button and slide the battery away from the Nokia logo
Slide the SIM card lock away from the SIM card.
Unscrew and remove the four T6 Torx screws.
Insert a plastic opening tool between the faceplate and the black backplate. Gently pry them apart, working from the lower end to the upper side of the phone.
Use the plastic opening tool to separate the top part of the backplate.