If I remember correctly it basically has one of the newest AGESA anyway, above that are only the new updates which enable Zen 3 but disable everything before Zen2, the point of no return, but I guess I'll check and see, nothing to lose right?
I used to have an RX 570 as well, from a miner who lied about it not being used, despite being clogged with dust lol.
It worked, but had to use workarounds for drivers to function properly, something was fucked in the firmware.
Now it's some other guys problem :D Tho to be fair I could always make it work, not my fault he couldn't, and the issue is only with windows, how it signs drivers, in Linux it works no prob. (But then gaming on it sucks D)