I think that bios 4804 brought only half of support for 3rd gen ryzen, full support came with bios 5007. Asrock on their page gave a warning that users with 1st gen do not update to BIOSes for 3rd ryzen becasue they will encounter problems. On Asus side, not a single warning and because of that I need advice from someone who has this combination. On asus forums there were some reports that users with 5xxx BIOSes and 1st gen ryzen have problems (black screen , no posting)
I suspect more BIOS updates will surface. Use the most recent one and hope for the best.
It may be a while before the BIOS is stable