Have my doubts that you will get much response here on Re-Flashing your card. You might try going back to EBay and trying to get them to do something. However I am sure the info was well posted before you bought it, so I'm sure you knew what you were buying.
That's why I would never buy a graphics card from anywhere other then my local shop ( For Return ability ), buying second-hand items from places like ebay/amazon ( other Sellers ) is just asking for a head ache. Anything done to this card now has a chance to brick it ( if it's Not Bricked Already ), so money lost. Unless you bought it for a ridiculous cheap cost, then one can say, " You get what you pay for ".
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Get a refund.
Even if you get the bios fixed, Sapphire warranty is not transferrable from original purchaser (if it has already been registered).