Supermicro X11DDW-L/NT User Manual page 182

Super X11DDW-L/NT User's Manual
Step 2. For the changes to take effect, press <F4> to save the settings and exit the BIOS
Setup utility.
Step 3. Press <Del> during system boot to enter the BIOS Setup utility. Navigate to the
Security tab and enter the Secure Boot menu. Set CSM Support to Disabled.
For the changes to take effect, press <F4> to save the settings and exit the BIOS Setup utility.
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