Cobra does it work fine w/o the flashing when you use stock bios? I know your pain i dont think its the card its got to be one of the bios combinations that could make it work correctly although there is a very small chance its just a really low bin board, mine is also low bin but it at least unlocks ok.
Here is a link to the bios files i used including the modded msi 6950, stock msi 6950, sapphire 6970, and amd 6970.
http://home.comcast.net/~jcheck10/6970 and 6950 bios.7z
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