I have PowerColor PCS HD4850 1GB graphics, once i tried to flash new bios for it with atiflash becouse i can't install drivers. But i forgot to make a backup and flashed bios for noPCS's so OS doesn't boot with it. I tried this one http://www.techpowerup.com/vgabios/54286/powercolor-hd4850-1024-090430.html but atiflash says that the *.rom is too big. Where i can get the original bios for my card???