I have purchased from ebay a 1390LMT. It came from California, with 'West' map. The previous owner de-registered it and I registered it in my name. However, even after I added a 4GB microSD, it still won't update with full NA maps. Now Garmin Express is offering me as 'update' the new 'West' map.

Besides using unlocked maps, is there a way to 'reset' the device to receive full NA maps?