Boot Option Priorities; Boot Override - Asus SABERTOOTH Z97 MARK 1 Manual

DBX Management
The dbx (Revoked Signature database) lists the forbidden images of db items that are
no longer trusted and 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.
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Boot Override

These item displays the available devices. The number of device items that appear 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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Delete dbx
This item allows you to delete the dbx file from your system.
Load Default dbx
This item allows you to load the downloaded dbx from a USB storage
device.
Configuration options: [Yes] [No]
Append Default
This item allows you to load the additional dbx from a storage device so
that more db's images cannot be loaded.
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To access Windows OS in Safe Mode, press <F8 > after POST (Windows
supported).
To select the boot device during system startup, press <F8> when ASUS Logo
appears.
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Chapter 3: BIOS setup