Hello. Here run GPU-Z, ATIFLASH and RBE. GPU-Z in Vista 64 and ATIFLASH in DOS for save the original bios file. GPU-Z and ATIFLASH saved file with 64 KB size. In 64 RBE and changed gpu clock minimum for 300 MHZ. Boot in DOS with no memory managers and atiflash - p 0 rv620.bin ATIFlash made the work. PC Power Off after. PC Power ON video OK in BIOS Startup. Later installing video driver Catalyst not recognize the gpu. PC restarted and I tried atiflash again. The problem is that ATIFLASH not find the video card. atiflash -p 0 atiflash -pa In Windows GPU-Z also not find the video card. Athlon 64 X2 4800 2GB RAM DDR2 ASUS M2N-X Plus and just 1 video card PowerColor Radeon 3450 256 MB in slot pci-e with no crossfire or pci video card. Please help me. Thanks.