When detaching the bottom panel, you'll notice two ribbon cables connecting it to the motherboard.

Use the tip of a spudger or your fingernail to flip up the small black locking flap.

Gently pull each ribbon cable from its socket.

The white line on this ribbon cable marks the edge of the connection area. To reinstall, insert the cable into the connector up to this line, and then close the locking flap. If the cable doesn’t insert easily up to (or very near to) this line, it’s probably misaligned and needs to be gently removed and repositioned.