The motherboard cover is secured with tight clips.

Insert the flat end of a spudger in the gap between the frame and the bottom left corner of the motherboard cover.

Lift straight up with the spudger to release the clips securing the motherboard.

Don't pry against the battery, as this could damage it.

This may take take a few attempts. It you're having trouble, try gripping the spudger closer to the flat end.

During reassembly, press down around the perimeter of the motherboard cover to engage the clips.