Mezza I would also like to know how you used that 'optomized' BIOS file cos atiflash doesn't recognise it when I try. Maybe because its a .bin file not a .rom? I followed crytobadger's instructions like when I unvervolted my card and it still won't work
Did you use atiwinflash (in windows)? Or atiflash at a DOS command prompt (after booting in to dos only)? The .bin / .rom difference shouldn't be an issue as far as I know. Also this bios flashing thing is independent of any undervolting as far as I know.