Did as you said Serg008. Tried to flash official bios F51 in pure dos using the Efiflash_0.80_mod. Still got same results "cannot run this program in dos" Seems as if the Efiflash is not supported.
I setup same scenero for another PC but with modded bios for it. Same error. I now am certain issue is in the Efiflash.exe.
you may have to disable TPM the protection platform for boot as well as legacy bios option. sound's like you are in a filesystem in efi. Have you a seperate partition GPT with efi... kindest regard's Starzú
Maybe try with a spare hard drive then. am not that clued up on the latest bollox that the manufacturer's and NCA NSA Intel "intel" say's it all cock ball's have nowadays. I would set the TPM off if you can put bios in legacy mode and try with spare hard drive one that is not GPT . reboot sys with usbboot to pure dos. If you have your old windows 98 CD about pop that in your drive and boot from that. that will bring you to pure dos mode. then run your flash program ... you may find you have problem's assessing usb and other drive's in pure dos mode. this you will have to figure out yourself. there is a dos util for usb in doscannot remember what it's called now but there is one if you need it . "use google" . I don't have the hardware that you have to test so this is just off the top of my head. In legacy bios mode. "Head's up do not use eufi flash for ami use standard amiflsh tool instead or use the one that your bios has to flash bios" Kindest regard's Starzú