This guide will allow you to separate the motherboard from the lower case.
Lift up all four rubber pads on the bottom of the router with the plastic opening tool.
Unscrew the four 11.8 mm T-8 torx screws from the bottom of the router.
Lift the bottom casing straight up from the router.
Remove the clear plastic casing by lifting it straight up from the router.
Separate the motherboard from the top shell by lifting it straight up from the router.