I used ATIFLASH with ATI.7000.32.Hyundai_010213.rom which had the same device ID as mine (5159) and it's now correctly recognized on bootup and by Windows as a Radeon 7000 PCI. The BIOS model information and the warning from the flash tool suggests that it should be seen as only 32MB but it appears to recognize and work correctly at 64MB (which it actually has).