How to Upgrade a Core Duo-based MacBook to Support WiFi 802.11n

Disassembly 2/3
On the opposite end there are 9 screws. Only 4 should be removed, from left to right: 2, 4, 7, and 9.

Two remain on each side of the battery connector.

To finish, remove the 3 screws which remain on the bottom of the machine. Notice that the one in the middle is the shortest! If you mix it up when screwing it back together, you will hit the motherboard!!