Here goes nothing
I'm not sure if it's gonna work or not because I don't have the same mainboard as you but it is worth a shot
You have to copy the file I attached inside /System/Library/Extensions/ BUT BEFROE YOU DO make a copy of "IO80211Family.kext" to your desktop and then replace the existing file with the one I posted, after that run "Kext Utility" to fix the permissions of the "Extensions" folder then reboot your computer and see if your wifi is working. Hopefully it works!
Don't forget to copy the original file to your desktop for replacing it if it didn't work.