There must be a way to copy it.
I don't know if you have an iGPU built into your processor, maybe you can switch to in your bios, that way you can disable the dGPU and save a copy of its bios when it's not active maybe ?
To be honest, I'm with the other members who are suggesting other forms of addressing whatever problem it is you're experiencing. I wouldn't mess around with the bios until you have absolutely no Other choice ,and the GPU is unbootable
Messing around with the bios because of instability or issues , is like performing brain surgery because you have an itchy foot.....there's other ways to address the matter most likely