Problem Bios Rx580 Nitro 8Gb with Z790

[38Nic]

Good morning,
I'm new to the forum and sorry for my English.
I have a PC configured like this:
I7 13700K CPU
Motherboard Asrock Z790 Pg Riptide
Ram G.Skill DDR5 32Gb 6400
SSD 1TB Samsung 990 Pro
SSd 1Tb Western Digital Sn850x
Sapphire Rx580 Nitro 8Gb video card.

I need the card not to play but to install Mac OS on the Western Digital SSD, on the other SSD I install Win 10.
I installed Win 10 but it doesn't see my video card, I read on various forums that it should be flashed, so I installed Windows using the integrated video card, then I downloaded and used Gpu-z to find the Sapphire bios.
I updated the bios but when Windows starts the PC presents some lines, it restarts and does a system restore.
Now I'm writing from the PC but if I open GPU-Z it only sees a generic Microsoft video card and not the AMD Sapphire.
How can I restore everything and fix it?
Thank you
Nic

Ok, it seems to work, I changed PCI port.
Is it possible to know if the bios installed is correct?
Thank you
Nic

Hi, I started flashing bios as per the written procedure and I get here, how do I proceed?
Thank you
Nic

And anyway now it gave me a series of lines on the monitor and it restarted....