I have a 2012 MBPr with a bad Airport card. I tried to replace it, but new new card did not fix my problem. So I'm using an USB Wifi adapter (Edimax EW-7811Un) and everything is working....EXCEPT Apple services (iMessages, iCloud, Mac App Store, FaceTime)!! I've come across this thread. Basically I need to fake that I have a native ethernet adapter. But, I cannot figure out the way to get this installed. Can anyone take a look and give some more laymen instructions? I think I'm mainly confused because these instructions are for a Hackintosh, but others are saying you can use it for an actual Mac too. Thanks in advance!