Remove the thirteen black screws and the single silver screw from the back of the phone with a JIS size 00 screwdriver.

The black screws are 2.8 mm in length.

The silver screw is 5.5 mm in length.

The black screw next to the camera and the flash is covered by a sticker. This screw can be easily removed as if there were no sticker on top of it. The point of the screwdriver should be able to pierce through the sticker easily.