I did the shader unlock this morning and it worked!
The new BIOS did also unlock the CCC Overdrive limits the whole way up to 950/1350, but that's not stable. I don't have time to test and find a stable overclock right now.
Thanks!
Here is a screenshot of what comes up when I go to Additional features in RBE after loading my stock BIOS.
The card is a PowerColor AX6950 2GBD5-2DH purchased at the end of December 2011 from Newegg.
I am really only interested in trying to unlock the 6970 shaders.
My concern is that...