Umm. You don't unlock BIOSes. You unlock CPUs. The BIOS already gives you all kinds of overclocking options, but the processor itself determines how far it lets you go.
My i5 760 only go x22 on the multiplicator, result 2.9ghz. The others configurations are blocked or doesnt exist... I think what the problem is my mobo, why doesn't exist others options
So, it's what I'm trying to say, in the bios of this card does not have these options! I think you change any bios version may unlock!