#1 Yeah, I read those before, so I have trouble understanding why this doofus thinks there is a BIOS and what they were trying to accomplish, or even why?
I don't know why he was trying to do it, but all x86 PCs have a BIOS or EFI/UEFI, which includes Macs. Macs have a custom EFI firmware but can emulate a BIOS via Boot Camp.
Perhaps he wanted to run an OS that required BIOS support but he didn't have a copy of Windows to install to get said BIOS support enabled. We had a similar brainiac mangle a laptop he was issued as part of his educational program, except in the process he stripped screws trying to open up the unit with wrong-sized screwdrivers.
Nevertheless if the EFI firmware is corrupt, the system will not boot, because the motherboard won't pass power on self test (POST) to even start the boot process. The only way to update the firmware at that point is out-of-band, meaning factory or bench work to reflash the chip without using the board itself to do the flash. In ye olden days one would pull the EEPROM out of it's socket and rewrite it using programmer, newer methods use diagnostic pins/connectors on the board that aren't particularly standardized.