My concern is that when a computer starts it is essentially stupid. It knows nothing more than to jump to a specific address at the top of the first 64k of BIOS ROM, and there is a JMP instructin to initialize a "bootstrap" loader for most of its devices, at least at a primitive level.
If the flash screwed the EEPROM or other chip used to store the BIOS, and there is nothing there in the address space on power-up, you are screwed.
There is no way in heck a floppy can recover, as the system is brain dead about how to use a floppy drive. It literally does not know how to use devices until the bootstrap load -- hardcoded in the microcode of the processor- can be found and launched.
You can expand, and extract and do whatever you want with a floppy, but the gentleman's choices are very limited here. If he can find an identical motherboard with installed ROM, pull the ROM and replace yours. You have some latitutude here as the BIOS revision levels often apply to several different motherboard models, and often several different motherboard OEMs.
If the local shop insisted only a replacement of the motherboard would work (which creates another whole set of issues), I would look on ebay for the motherboard model or any OEM box sold with the same BIOS version level, and swap the darn BIOS PROM.
Intel Tech Support may be some help. But if the BIOS is missing the JMP instruction to the bootstrap loader, there is no floppy disk on earth that can help. Swap the ROM BIOS chip itself, or find someone who can use an EEPROM burner and load the image from the floppy into the chip.