Gigabyte MD50-LS0 User Manual page 15

Lever B
Step 5:
Once the CPU is properly inserted, carefully replace the
load plate. Then secure lever B under its retention tab.
The protective plastic cover may pop off from the load
plate during the process of engaging the lever. Remove
the cover. Save the cover properly and always replace it
when the CPU is not installed.
Hardware Installation
Step 6:
Finally, secure lever A under its retention tab to
complete the installation of the CPU.
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Lever A