Please help! My stem keeps saying 'check in progress' it then freezes and shuts down altogether before rebooting 30 seconds later. It also disconnects the radio at this time. It has now proceeded to say 'Insert Navigation CD'. I don't ever recall being given one from the dealership at time of purchase from new. I have contacted customer services who couldn't help but just told me to go to a dealership (passing the buck!) Any way of getting hold of the RT6 latest CD update please?