I received a unit that was caked with dust everywhere.  I'm not sure exactly what is done in the part of the "Amazon refurbished" process but cleaning isn't one of them. Also, I purchased a M.2 wan card for wifi and BT. That also didn't work. I doubt that it was even checked to see if it was working or not. I did it with 3 different cards. It did not work. I returned it cleaner than I received it. Don't trust these "Amazon refurbished" items IMO.