i already flashed a XFX bios on my GPU, no problem, but you right, its a risk...These instructions are extremely speci00000000000000000,fic to your brand and model of GPU so I would not advise everyone just updating with that particular bios or even doing so unless there is an issue with multiple things in your card. BIOS updates can make or break and you really need to be confident in your skills and have a dual bios card.
but you can send a message to your gpu manufacturer support and get a new and correct bios for your card.