Lay the bottom part of the device upside down on a table.

Locate the four PH1 screw heads on the underside.

We used the driver and 150mm driver extension with a PH1 screwdriver bit (from 64 Bit Driver Kit) to elongate the driver. (See note below and second image)

NOTE: The PH1 screw heads are located 5cm into the device. Make sure to use a PH1 Driver that is at most 1cm in diameter and at least 5cm in depth.