Lanner FW-7573 - Manual (Page 36)

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Bios Settings
Chapter 4
Network Application Platforms
Item Options
Boot Override This section of the Boot
Menu allows booting from a
specific device immediately.
Therefore you should see
an entry for all bootable
devices.
Launch EFI Shell from
filesystem device
This option allows you to
attempt to launch the EFI
Shell application (shellx64.
efi) from one of the avail-
able filesystem devices.