I'm not familiar with that board but if it has bios flashback you could do a bios update even without a cpu or memory installed, it could be the cpu but usually them show up at 0d
I know it may sound silly but I've seen it more times that I would ever expect, are the memory modules in the correct slots and have you tried just 1 stick or no sticks at all to see if the code changes? cmos reset and all that?
Same mobo same issue, had this board since it was release and it's always been that way. ryzen master readings are the correct temps. Agreed that this forum is virtually dead!!!!