Do you have basic warranty left? If so then get your dealer to deal with it.
If your unit is out of warranty and if you have the 'Can't Unlock Maps' message then you can update the maps you had (note the tense) with newer ones yourself. It takes time to do but if you follow through you will get it working;
If your unit is stuck on 'loading', you may have a bad solder joint on a board inside the radio - good luck with that if you have no warranty - my spare remains on the self, available for purchase.
