David 888888

MMi 3g keeps crashing and not booting up more often. So I have bought another with full matching part number. When. I plug it in, the new unit comes on straight away. But you get the message features disabled turn on ignition. Is this because the unit have bought has a fault. Or is it because it needs coding to the car as I read somwhere they are coded to the vin. Happy to send a case of beers to somebody who can advise me.