Asus P9D-E/4L - Manual (Page 105)

4-40 Chapter 4: BIOS setup
Discard Changes & Reset
This option allows you to reset without saving your changes. When you select this
option or if you press <ENTER>, a confirmation window appears. Select Yes to
discard changes and reset.
Restore Defaults
This option allows you restore or load the default values for all the setup options.
When you select this option or if you press <ENTER>, a confirmation window
appears. Select
Yes to apply the default values or press <Esc> to exit.
Launch EFI Shell from filesystem device
This option allows you to launch the EFI Shell application (shellx64.efi) from one of
the available filesystem devices. Select Yes to proceed, or No to cancel, and then
press <Enter>.