Follow the instructions to replace the base cover assembly.
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.
Remove the nano-SIM-card tray if your computer comes with one. SeeConnect to a cellular network (for selected models)
.Close the computer display and turn over the computer.