I purchased the update for the Midwest map of the United States. I can no longer access the rest of the United States on my TomTom XL. Is there a way I can access more than just the Midwest States? I don't care if I have to remove the Midwest. I would like to be able to use it while driving in Arizona and Nevada. In reading about it, the instructions say to go to TomTom home and click on update device, I can't find that option.