Four round, plastic plugs are located on the back of the device.
Using a metal spudger, carefully pry up the plastic covers.
The covers are all glued on, so be careful not to scar the casing when prying them off. If possible, use a spudger or plastic opening tool to remove them.
When I search for a 1.8 cm Torx Plus TR drill bit, I see a whole set from Amazon. Is there a particular number or head size just so I can purchase one drill bit?
I need more information on the Torx Plus bit can you provide the exact size as you used. The 1.8cm is not easy to search for. Brand and exact size number would help.