Dell Latitude 3300 Owner's Manual page 60

3 Loosen the 10 'M2.5xL8.5' captive screws that secure the base cover to the computer.
4 Use a plastic scribe [1] to pry the base cover along the edges [2] to separate the base cover from the computer.
5 Lift the base cover up, away from the computer.
60 Disassembly and reassembly