Other than my 2720 and the MMI 2G nav in my Audi, my wife has a TomTom one v4 with just the Italy maps. Since the GPS is not new I think that I've to update the maps.

I've downloaded the latest Italy maps, or so I think, Italia_855_2938 but now I would like to know the steps to perform a succesful update of the TT maps in the units.

I've tried to read some tutorials but get lost in a minute...

Can someone help? I can access a Mac (OS X 10.6) and a PC with Windows 7 Pro 32.