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Hi people, i'm facing the same problem except that i have a real macpro, my two ethernet ports are broken and i'm using wifi adapter, i've tried the method deleting the NetworkInterfaces.plist and reset the PRAM (or something like that) but no luck. I also found a method with .kext and DSDT here https://github.com/RehabMan/OS-X-Null-Ethernet but i can't understand anything of this procedure, it is so difficult for me if someone can help, the only thing i want to do is download osx yosemite Thanks guys in advance