Remove The Lower Case - Lenovo Legion 5i Hardware Maintenance Manual

Figure 5. Remove two screws and remove the back cover
Screw specifications
M2 × L4
Go to https://support.lenovo.com/partslookup
replacement part:
Back cover

Remove the lower case

Make sure the computer has been shut down before servicing the computer.
Step 1. Place the computer upside down on a flat surface.
Step 2. Remove ten screws, pry up the latches, and then remove the lower case.
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Lenovo Legion 5i (16", 9)Hardware Maintenance Manual
Number of screws
2
to look up the Lenovo part numbers of the following
Torque
1.85 ± 0.15 kgf-cm