I'm currently trying to edit my graphics card Device ID on a notebook using Phoenix BIOS v4.0 Revision 6. I have the modified Video BIOS prepared, checksum corrected, compressed, and inserted in the System BIOS. The BIOS is flashed, and when I check the Option ROM with PCI Scope, it shows that all the changes have been made to the Video BIOS. Seems like everything went okay, but when I check the registry entries, the IDs never change (Even after a complete format and reinstallation of the OS).
My current line of thinking right now is that the new BIOS is not being written to ROM because the Video BIOS is shadowed, so perhaps it only resides in RAM and Windows is checking the ROM for Device info. Unfor tunately my BIOS setup does not have any shadowing options I can disable, so I can't test this idea.
So at this point I'm trying to figure out how I can unshadow my Video BIOS. Any ideas?
I've downloaded many Phoenix BIOSes trying to find one that has the option to enable and disable shadowing in setup, but I haven't come across one yet. If anyone has a motherboard that uses Phoenix BIOS and has this option please let me know. I'd like to disassemble that BIOS to see if I can add that bit of code to my BIOS so I can disable shadowing.
Thanks in advance to anyone who can help with some ideas.
