Asus AP1720-E1 - Manual (Page 100)

4-32 Chapter 4: BIOS Setup
Discard Changes
This option allows you to discard the selections you made and restore the
previously saved values. After selecting this option, a confirmation
appears. Select [Yes] to discard any changes and load the previously
saved values.
Save Changes
This option saves your selections without exiting the Setup program. You
can then return to other menus and make further changes. After you select
this option, a confirmation window appears. Select [Yes] to save changes
to the non-volatile RAM.