I'm not sure, but think that functionality requires at least some part of the previous BIOS to be intact.
If this solution doesn't exist/work, you will need to go the route of finding the (often undocumented, sometimes unpopulated) SPI flashing header, and using an external device to directly write a working BIOS onto the SPI flash chip.
Sold it on eBay (disclosed as such).
Later sent a message to the buyer asking if/how they fixed it. They shared that they did: with a similar mobo, booted the good one up, hot-swapped the EEPROMs and then ran the BIOS update on the bad chip.
Smart.
Another time I was less lucky and broke an edge off the CPU die while installing the heat sink. This was during the time when the CPUs had exposed silicon with no metal lid. Instant dead CPU, expensive mistake for a college kid.
Y'all these days are spoiled with your headers, test clips, howto videos and cheap EPROM programmers.
Had to reflash an i2c 24-series eeprom on a satellite receiver. You don't want to power the whole board, so gotta lift the VCC pin off the SOIC chip (not hard if you warm it up and pick at it with a soldering iron), solder kynar to leads/nearby lines for VCC, data and clk lines, and aligator clip for GND. Connected to some self-made janky 24 series parallel port interface.
It would be smart to implement it as seperate chip, so it can work even with an empty SPI flash. Would also explain why it's only available on some motherboards.
But it wouldn't entirely surprise me if they managed to implement it as pure software inside an extra microcontroller core inside the chipset (or another chip). There are dozens of microcontrollers cores spread out over the various chips on the motherboard which might be abused for such purposes.