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The system didn't even recognize the card first. After I replaced all the relevant (I think) kext's from 10.4.7: AppleAirport, AppleAirport2, IOPCIFamily, IO80211Family and followed the instructions for fixing wifi problems with Atheros chipset, the card was recognized as a Airport Extreme.

 

But somehow it cannot connect to any network. Any ideas?

You only need to edit one file in IO80211Family.kext, adding "pci168c,13" to info.plist. Your wireless would be recoginzed at system profiler after this step.

 

Sometimes it is not enough if you also have an integrated ethernet adapter because system wants to allocate the BSD device name "en0" to both of them. In this case, you may want to change the value "en0" to "en1" for the wireless at /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist. Unfortunately, this might not work.

 

The simpliest way is to reinstall the system with the wireless unpluged. Don't plug back your wireless to mobo until the "en0" has been asigned to the built-in ethernet. Then you plug it in, and it starts working.

Edited by asio

Thanks! I realized that it might have something to do with the en0/1 thing and I did tried to edit the Networkinterfaces.plist, after the card got recognized but cannot connect to any network (the Airport logo's there, card shows up in System Profiler...). Anyway, the card just cannot connect and it cannot detect any wireless networks either. But it can been seen from Mac OS though.

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