Ho w you have use this bios with sapphire nitro 8gb ? I have try and didnt work so i found i good bios for nitro 8gb i can give link if need.
I just download the bios and apply it with atiflash tool, I am using a second card to boot else it doesn't boot. But I have no idea why it doesn't boot with this one.
But I have the latest driver 16.9.1, it doesn't work with older version
You may have to reinstall drivers after boot.
I will try your bios if you share ^^.
Thanks