I got the B550 Tomahawk with a 5600X, and need to update the BIOS.
I followed this guide:
Using only the 24-pin and the CPU 8-pin on the mobo, no CPU or RAM or anything.
I got a FAT32-formated USB stick with only the BIOS file renamed to MSI.ROM.
My PSU is a Corsair RM850 from 2014, but I don't think that is the problem, since it worked fine in my old rig.
When I push the "Flash BIOS" button, it starts blinking as in the guides. Then the MOBO LEDs turn on, as in the guides.
The problem is the LED for "Flash BIOS" never stops blinking. Had it going for over 2 hours, still blinking. The debug LED for CPU is also lit, without having a CPU in the socket.
I've tried clearing CMOS, tried another USB stick, tried an older version of a BIOS update. Took everything out of the case, and off the mobo.
First time I tried to flash the USB stick had another format, FAT, but I reformated to FAT32.
The PC won't post without updating.
Is the mobo bricked? Did I do anything wrong?
Sorry for wall of text, trying to add as muchdetail as I can.
Thanks