MSI X99S GAMING 7 Manual - Manual (Page 81)

Chapter 3
3-14 BIOS Setup 3-15 BIOS Setup
▶Restore Defaults
This item is used to restore/ load all default values by the BIOS vendor.
▶Boot Override
The installed boot-able devices will appear on this menu, you can select one of them
be a boot device to start booting.