Supermicro X12 Secure Boot Configuration Instructions page 14

Super Secure Boot Configuration Instructions for the X12 Motherboards User's Guide
Device Guard Ready
Remove 'UEFI CA' from DB (Database) (available when the system
is not in Device Guard Ready)
Select Yes and press <Enter> to remove the Microsoft UEFI CA certificate from the database
(DB). The options are Yes and No.
Restore DB (Database) defaults
Select Yes and press <Enter> to restore the DB variables to the manufacturer default
settings. The options are Yes and No.
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