Asus ESC4000A-E12 - Boot Override; Launch EFI Shell from Filesystem Device

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Chapter 4: BIOS Setup
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 allows you to attempt to launch the EFI Shell application (shellx64.efi) from one of
the available filesystem devices.