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I've added the BIOS signature check to the pixel clock patcher: https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher
1. Flash Bios. Do not reboot when asked.
2. Run atikmdag-patcher.exe to patch the driver.
3. Reboot.
I haven't tested it with a modified BIOS, so let me know if it works. You can undo the patch by running the patcher again. If you don't need any of the pixel clock limits, you can rename the file to atikmdag-patcher-bios.exe to patch only the BIOS signature check.
1. Flash Bios. Do not reboot when asked.
2. Run atikmdag-patcher.exe to patch the driver.
3. Reboot.
I haven't tested it with a modified BIOS, so let me know if it works. You can undo the patch by running the patcher again. If you don't need any of the pixel clock limits, you can rename the file to atikmdag-patcher-bios.exe to patch only the BIOS signature check.
Just use this patch and reboot
Source: http://www.overclock.net/t/1604567/polaris-bios-editing-rx5xx-rx4xx#
I follow your procedure taking the stock bios from this link.
Then i flash it on my vga using atiflash, and then i executed atikmdag-patcher.exe
Buuuuuuuuuuuuuut, it doens't work yet )):
and make sure crossfire is disabled (check on gpu-z)
According to gpuz crossfire is disabled!