If you are working on the 7200-series model, this metal plate will have been already removed as part of the removing the larger motherboard plate. You may skip this step if this is the case.

Carefully flip the console over so the bottom is facing up.

Use a Phillips #1 screwdriver to remove the eight 4mm screws on the metal plate with the X-like symbol.

Use a plastic opening tool to remove the metal plate with the X-like shape.