Remove the 2 screws in the bottom case front section.

Remove a screw from the top, adjacent to the mode wheel.

Remove the front cover. This requires a fair amount of wiggling in order to release it at the top. There is a hidden clip just to the left of the on/off button which requires a little force to release, especially on a first disassembly. Easy does it.

If necessary, insert a small flat bladed screwdriver at the end of the silver trim to the left of the on/off button. Lift it by just half a millimetre or so whilst pulling the front cover. This should release the clip. Take care not to bend or otherwise damage the trim.