I sold my MBA and want to reset it to factory settings i.e. so that when he turns on the MBA for the first time, he'll see exactly what I had when I bought it new. Start up from recovery partition (command-R) erase disk with DU and reinstall. However, it asks me to connect to the app store. As I don't the new owner to inherit my settings, is there a way to reinstall without connecting to the app store ?