Acer Altos R720 Series - Manual (Page 135)

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Boot Options
The Boot Options menu allows you to set the BEV device priority
during system bootup. It also displays information about the installed
storage devices.
Parameter Description Option
BEV Device # Sets the boot order of the Bootstrap
Entry Vector Devices. BEV devices are
devices which have a bootable Option
ROM such as a network card or onboard
network controller.
Press Enter to access the BEV Device #
submenu.