Hi all,
I got my the USB and great news it worked for me. Maps are updated and no more "Can't Unlock Maps" error.
Cost me $164 shipped to my door the next day. This is with the current $50 savings which is applied at check out. Note savings is only applied until 30 Sept 19.
Again all I had showing was the "Can't Unlock Maps" box and no access to the Navigation features. All other things worked normally IE radio etc.....
Took around an hour to follow the instructions and install.
I hope this helps anyone else with this issue where it out of warranty.