6. Detach the connector
, and then remove the coin-cell battery
7. Install the new coin-cell battery
, and then attach the connector
8. Turn over the computer and reinstall the nano-SIM-card tray.
9. Connect the ac power adapter and all disconnected cables to the computer.
10. Reset the system date and time in the UEFI BIOS menu. See "Set the system date and time" on page 24.