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So, I booted into a DOS environment, and ran ATIFlash on the firmware I got from netkas.

Low and behold... it flashed successfully!

So I rebooted my computer, only to find another problem.

The endless startup chime.

It goes "BAHH BAHH BAHH BAHH BAHH BAHH..." into infinity now, if I boot it up with the card in it.

Any ideas? I used the second firmware provided at https://forums.macrumors.com/posts/7271105/
 
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