I did nothing to the FW, just put it right into my case and added the cooler and booted... I did have some trouble at first with booting unraid, but that was because I have a few old hardrives that had windows still on them... lol Once i set the boot too only usb it boots fine.
I am passing through my GPU to a VM and it works, this took me about 3hr to find a fix. You have to get the correct BIOS for your card and load it in your VM. I got the correct bios from here: https://www.techpowerup.com/vgabios/ and i had to edit it with a hex editor like in this video:
That above is the article which i used methods from both videos in that article.
I did have to use GPU-Z to figure out what bios version my card had and make sure i downloaded the correct bios version file.
Then in my VM i have it set this way:
Let me know if this helps or if you have any other questions.