Toughbook CF-C2 update went wrong how to recover?

[Fuexline]

i made a flash with ami V4 EFI Flash tool under WIndows, this worked well but after reboot the device turned off becuase i did accidently turn the device off, now when i turn it on the lights are working its charging the battery and stuff but screen seems to be dead 

so i made an fat 32 USB drive with 4GB and put the original romfile on it named AMIBOOT.ROM pressed the home key and other stuff but it does nothing

[Fuexline]

okay found out that its an aptio V4 EFI so method with pressing home and plugin powercord does the half of the trick, but how do i extract the bios recovery file from the bios exe?