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13" MacBook RAM (Memory) Replacement
Use a coin and turn the battery lock 90 degrees.
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Lift and remove the battery.
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Fully loosen, three Phillips screws along the back of the battery compartment. These three screws are captive and do not come out. They remain in place on the RAM cover.
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Pull the metal lever to the left firmly until the RAM chip is released. Pull the RAM chip out.

When installing new ram be sure the chip is seated all the way into the socket. If the RAM chip is not seated in the socket, your computer will not boot.

Reassemble this device by following these instructions in reverse order.
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Remove two Phillips screws from the outer case of the optical drive bay. They are 3.25 mm screws.
The optical drive ribbon cable needs to be disconnected by lifting up on the connector.