The plastic frame is clipped inside the steel body with four clips, two each on the left and the right side of the watch, near the corners. You can stick a small screwdriver into the cutouts right above the clips and gently lever the plastic frame up, corner by corner.

Once the clips are released, use a pair of tweezers to grab onto the black plastic frame and remove the internal hardware.

Adhesive on the back side of the battery holds the internal components to the front case.

Use tweezers or a plastic opening tool to disconnect the ribbon cable from the motherboard.