Use the Phillips #00 screw driver head to remove the following screws that secure the motherboard to the top cover:

Four 4.6mm screws;

Two 3.3 mm screws.

Use the Phillips #0 screw driver head to remove the one 4.5mm screw that secure the system board to the top cover.

Use the iFixit plastic prying tool to disconnect the seven marked data cables linked to the system board.

Lift the motherboard to remove it from the top cover.