Question about AMD Ryzen 7 5800X

Ah, you also have a mainboard from MSI.

Yes, I did it, but on another MSI mainboard, also with an x570 chipset (Tomahawk Wifi). Of course, I can't judge whether it worked yet, because I would have to have installed the other components. But from a purely procedural point of view, the USB stick flashed during "Bios flash" and stopped flashing after a few minutes. In my case, it was the USB 2.0 port (2.0=black, 3.0=blue) right next to the "Bios-Flash" button that I could use.

Requirement:
01) Download the MSI-Uefi Bios update & save it to the stick (directly to root, e.g. D:\ ) and rename it to MSI.ROM (about 32 Mega er Mebibytes size).
02) Connect the power supply to the mainboard (built into the case) as described in the manual.
03) Connect the USB stick with the new Bios to the correct port.
04) press flash button (with a pencil...)
05) wait until it stops flashing (maximum 5 min)