Greetings. Due to certain circumstances I'm forced to sell my retina macbook pro. What i wish to do is revert it to factory standard. Specifically, so that it was like when i got it and the new owner can have the ilife and iWork package that i got. I heard doing a network recovery does that. So thats what I'm doing. But what i question is how can I do the network recovery, then update the machine to Sierra keeping the goodies without logging into my apple id or anything on the machine?