I have asked to Power color.
Yes now i have not warranty.
Now i have send email to asrock and amd, I waiting for the answer.
ps the files in post, later a search
are
https://www.techpowerup.com/vgabios/232342/232342
https://www.techpowerup.com/vgabios/234240/234240
they are for a amd rx 6800 xt