Supermicro X11DPX-T - Secure Boot Settings

Super X11DPX-T User's Manual
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F.3 Secure Boot Settings
To have the secure boot support, be sure to follow the steps below (Step 1 ~ Step 4).
Step 1. Set Secure Boot Mode to Standard. Press Yes to install factory default keys as needed.
Note: The Key Management menu will become unavailable when Secure Boot Mode
is set to Standard.