If you cross-flash another BIOS, it may work, but you risk the board not starting up anymore, and then you have to mess around with an external programmer like this guy,
When you accept that risk, i link two flash tools in that thread, you have to use the older one with an AMD 300-series board.
Also note that this is a low-end budget board model, so you cannot use a high-end CPU in there, the VRM cannot handle it.
It's only a 3-phase VRM for the CPU, with cheap MOSFETs and no VRM heatsinks, so the VRM will overheat very quickly with a powerful CPU model.
Here's an example of what happens when you put a high-end CPU into a low-end board:
"When the Ryzen 9 5950X is under full load, the VRM section of the ASRock A320M-DVS (budget board model) is roasting at over 120°C."
This can easily happen with a lower CPU model than the 5950X already. Your board is good for a low-end to lower-mid-range CPU model, not more.
So in case you get support for the new CPUs going with your cross-flash, keep that in mind about the CPU selection.