There are four more "A" screws on the sides of the device, circled in green. Remove them and put them in the "A" pile.

The two screws circled in yellow are type "B" screws. Remove them and put them in a separate pile.

The 3rd pic shows the difference between "A" screws (left) and "B" screws (right). There are 8 "A" and 2 "B".