What is “launch efi shell from filesystem device” from the boot manager?
To access the UEFI menu, create a bootable USB media: Format a USB device in FAT32. Create a directory on the USB device: /efi/boot/ Copy the file shell. efi to the directory created above. … Rename the file shell.efi to BOOTX64.efi. Restart the system and enter the UEFI menu. Select the option to Boot from … Read more