Always save a copy of the current BIOS before FLASHING
Improperly video card flashing means that you can see anything
to undo [reflash the old BIOS]
There is a discussion in the Windows 2000/XP Driver Forum about saving your current BIOS and modifying the Vendor ID etc.
http://driverheaven.net/showthread.php?s=&threadid=2943
I have seen references on this forum to Radeon 8500 BIOS's at this website - use with caution
http://colosseum.com/pimento/binbla~1/binbla~1.htm
from Catalyst 2.4 - you can determine the BIOS version from Display Properties --> Settings ->> Advanced Settings [lower left] --> Options Tab --> click on DETAILS button to see all kinds of information on the Video Card and Video Drivers installed