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I have a question.

Right now I have Asus GTX 660 DC2 card that I performed a BIOS flash on and got the voltage unlocked and core max @ 1201 and memory @ 1650 (6600) stable.

I bought an Asus GTX 660 DC2 OC and added it to my system.

When I want to flash its bios it says "bad checksum" but I downloaded its bios from various websites and tested to unlock them BUT it still said "bad checksum".

How am I to unlock this one?