Need help flashing 7800 GTX 512 for Power Mac G5

takeshi7

macrumors newbie
Original poster
Jan 12, 2014
26
0
Hi,

I've been trying to flash my XFX 7800 GTX 512 MB so that I can use it in my G5 quad. I've tried flashing every ROM from this thread:
http://forums.macrumors.com/showthread.php?t=1552556
When I try to run nvflash from a bootable USB disk it says that "this program can't be used in DOS mode" so I've been running nvflash from within Windows 7. I was able to back up the ROM file that's on the card with nvflash, but when I try to flash a new ROM it beeps twice and nothing happens (I think I see a command prompt window open for a split second though). Any help would be greatly appreciated.
 

ifrit05

macrumors regular
Dec 23, 2013
222
78
Near Detroit, MI. USA
Never use Windows to flash BIOS/ROMs!
What kind/version of DOS are you trying to run? nvflash should run in DOS mode (it is a DOS program).

Have you tried FreeDOS?
 

takeshi7

macrumors newbie
Original poster
Jan 12, 2014
26
0
I was using a windows 98 boot disk created with the HP USB Disk format tool.
http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html

I was using nvflash 5.142 and it definitely wouldn't run within DOS on the USB stick, but it did run within windows.
http://www.techpowerup.com/downloads/2258/nvflash-5-142-for-windows/mirrors

I was able to at least back up the ROM that is on the 7800. nvflash would then recognize that the original PC ROM was compatible with the card, but when I tried to open any of the Mac ROMs with nvflash it would close and flash a message on screen along the lines that the rom isn't compatible.
 
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