The battery door has been removed in these photos, but this step is not necessary.

Flip out the screen. There are four Philips #00 screws securing the black plastic case.

The screws are located symmetrically: one on the left side, one on the right side, and two on the bottom (on either side of the hinge).

Detail of a 2x2.5mm side screw.

Detail of the two 3x4mm bottom screws.