Boot Option Priorities; Boot Override - Asus PRIME X370-PRO User Manual

Allows you to load the downloaded db from a USB storage device.
Append Key
Allows you to load the additional db from a storage device so that more images can be
loaded securely.
The db file must be formatted as a UEFI variable structure with time-based authenticated
variable. DBX Management
DBX Management
Delete Key
Allows you to delete the dbx file from your system.
Set New Key
Allows you to load the downloaded dbx from a USB storage device.
Configuration options: [Yes] [No]
Append Key
Allows you to load the additional dbx from a storage device so that more db's images
cannot be loaded.
The dbx file must be formatted as a UEFI variable structure with time-based authenticated
variable.

Boot Option Priorities

These items specify the boot device priority sequence from the available devices. The
number of device items that appears on the screen depends on the number of devices
installed in the system.
To select the boot device during system startup, press <F8> when the ASUS Logo
appears.

Boot Override

These items displays the available devices. The number of device items that appears on
the screen depends on the number of devices installed in the system. Click an item to start
booting from the selected device.
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Chapter 3: BIOS Setup