PS - this information is in the AVIC 500BT manual. If you read the manual, you can pretty much solve every problem.

for people that are saying the product key only shows once, it doesnt show anymore once its been activated, etc.... please stop doing so. the product key will ALWAYS be there regardless of the status of the account. mine has gone to that "msn direct is connecting" screen several times. a hard reset always worked for me. please note a reset isnt just shutting the unit down then powering it back up. it means actually pushing the reset button. for the avic f900bt its located at the top left of the unit. for the others im not sure where it is.