Needless to say, proceed at your own risk.
I'm reading up on the 6970 with a view to an upgrade and one one retailer's forums (NCIX) some posters were complaining that they'd "bricked" (as I understand it, they've been left with artifacts even after flashing it back to 6950) their 6950 after flashing them with the 6970 bios, others have not had any problem.
At the end of the day, it's up to you to decide if it's worth the risk but that anecdotal evidence suggests that the risk is more than just theoretical.
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