I've got myself an MSI twin frozr II 6950 2GB without the bios switch that I'm trying to unlock but keep hitting a wall. I either get a message saying "cannot erase rom" or "rom not erased" depending on which method I use. I've tried just using the latest atiwinflash and RBE 1.28 to modify and flash the bios but it ends up with one of those messages. It's worth mentioning I think that I'm using windows 8 64 bit and am trying to flash in windows. I've tried using the command prompt (run as admin) in windows as well but it also fails me. When I run the command "atiwinflash -unlockrom 0" I get a message saying "rom unlocked". Then I run "atiwinflash -f -p 0 modifiedbios.rom (I've tried renaming it to .bin which produces the same result.) I'm stuck and I don't know what's wrong, can anyone offer any assistance please? Edit: I wanted to update this in case someone was following it. I managed to unlock the shaders on this card. I had to make a bootable dos flash drive and was able to flash successfully through that without even having to unlock the rom. The gpu would only accept a bios that had the shaders unlocked. I was using RBE and editing the overclocking limits along with unlocking the shaders. If I flashed a bios with modified frequency limits the card would not boot into windows.