Flashed wrong bios on b450-a pro max

BIOS/UEFI Modding BIOS Modding Guides and Problems
1

Hi all, I just did something incredibly stupid. I used the MSI flash tool to flash my B450-A PRO MAX with a B450M-A PRO MAX bios.

Do I have any options to fix this? I tried clearing CMOS and flashing with the flash button and USB stick. It access the USB stick for a second or two, board restarts and LED flashes white 3 times and stay white solid. The other LED near the ATX 24PIN connector is solid white.

the bios chip is a MX25U25673GZ4I40 can these be programed with the cheap usb programmers and clip on ebay?

So my B450-A PRO MAX thinks its a B450M-A PRO MAX now. So it will only flash B450M-A PRO MAX bios. If only I could force the correct B450-A PRO MAX bios to flash.

2

Maybe. I assume it’s worth a try, other option would be buying/ soldering an already programmed chip.

Backup the old content before trying to write…

3

Thanks for the reply, also is it possible to program via SPI interface?

4

MX25U25673G, 1.8V, 256Mb, v1.1.pdf (macronix.com)
You mean JSPI1 header…

image
image699×521 68 KB

if so, look here:
MSI B450M-A PRO MAX winbond 25q256jweq | Peekaboo (pikabu.ru)

Theory: Upgrade 128Mbit (non-MAX sku) board to 256Mbit (MAX sku) board | MSI Global English Forum

EDIT: For SPI interface program?!?!?!?!?!?

5

Yes. If only I could change the checksum on the bios file so it accepts it I would be fine.