Lenovo ThinkCentre M80t User Manual page 72

Note: To remove the screws, you need a special tool (T15 star wrench).
1. Remove the computer cover. See "Computer cover" on page 44.
2. Disconnect the E-lock cable from the system board.
3. Remove the E-lock.
4. Install the E-lock.
5. Connect the E-lock cable to the system board.
6. Reinstall all the removed parts. Then, reconnect the power cord and all disconnected cables to the
computer.
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M70t and M80t User Guide