NEW Tomtom One Classic little Information Please Help

Hi, I meet bought a newborn TomTom One Classic UK and Ireland Maps I think is the v40

Comes with 1 GB interior Memory

I have been disagreeable to find some aggregation in how to establish US maps. but can't find anything ( most of infor is for One version v3)

I rattling revalue if someone saucer me in the right directions

Thanks