I would probably just leave that one alone unless you have another GPU you could run in your setup at the same in the event you mess up your card and have to flash back to your stock vBIOS
TechPowerUp has some vBIOS's listed for the R9 270x .. you'll have to do some research on how to flash your GPU though .. watch some videos .. maybe kill a few chickens, not sure
https://www.techpowerup.com/vgabios/?did=1002-6810-1002-0B04