Follow the instructions to replace the memory module.
Before you start, read Generic Safety and Compliance Notices.
Disable the built-in battery. See Disable the built-in battery.
Turn off the computer and disconnect the computer from ac power and all connected cables.
Close the computer display and turn over the computer.
Remove the base cover assembly. See Base cover assembly.
A Mylar film might cover the memory module. To access the memory module, peel off the film first. Do not damage the mylar film and attach it in place after installation.

Memory module replacement might cause memory retraining. For details, see Detect memory retraining (for Intel models only).