Following on....after a laborious read around. Try clearing (getting rid of map junk) the Nav box as alluded to in my last post.... I'm thinking that your error message may be that your Nav box is out of memory. Is it the case that an upload auto clears or configures map memory correctly...always?
Clearing the Maps out of the Nav box and trying to get to a factory clean state...lets say:
HOW TO DELETE A MAP
Start the Map Update Tool application on your computer.
Insert your USB stick into your computer.
Note: Your computer must be connected to the internet.
Select MANAGE MAPS.
Select which maps you want to delete.
Select DELETE MAPS. The Delete button shows the number of maps you selected.
Note: The map is marked as pending deletion. The map is deleted when you insert the USB stick into your Navigation System.
Insert the USB stick in your vehicle's Navigation System and follow the on-screen instructions.
Tip: You can do multiple map management activities at the same time, for example adding and updating maps.
The above comes from the menu at the right lower side of the updating page:
https://apps.nissan.navshop.com/en_gb/s ... updatetool
Back to the original question since TomTom logo is shown. I'd say Post codes (area) are embedded (map linked) by TomTom and I can't see anything about Post Code additions subsequent to any map update. Unless a separate menu option exists on the Nav Box itself?