Asus Z9PR-D16 - Manual (Page 112)

4-50 Chapter 4: BIOS setup
Discard Changes & Reset
This option allows you to reset the Setup program without saving your changes.
When you select this option, a confirmation window appears. Select Yes to discard
changes and reset.
Restore Defaults
This option allows you to restore/load defaults values for all the setup options.
When you select this option or if you press <F5>, a confirmation window appears.
Select Yes to load optimized defaults.
Boot Override
These items displays the available devices. The 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.
Launch EFI Shell from filesystem device
This item is for launching the EFI Shell application from one of the available
filesystem devices.