Thanks for the information. sorry that i did not make things very clear. I did patch the driver with atikmdag-patcher-1.4.5. And I successfully modded the BIOS of other cards (msi RX580 8G/Gigabyte RX580 4G/Sapphire RX580 8G). I just failed on this card only.
Okay so I take back what I said, It seems your problem is really difficult to solve cause you reflashed with the original Bios and the problem still persists. Use ddu to clean up everything, reinstall drivers, use only the card that has the problem and see what comes up next and then you come here and feedback us.
Also, maybe you did not use the atikmdag-patcher-1.4.5, maybe you think you used it, try it again.