Maybe you just read the wrong threads. Here's some specific to your 255W:
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ] [basic maps the same on your 255W as with 7xx series, but no gmap3D capability]
And for getting the maps in the first place: [Only registered and activated users can see links. ].
A couple more you mightn't need if you've absorbed all the above threads fully, but for extra fun 'homework': [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ].
Post again with specific questions here or in the relevant thread if you're still having trouble. But you'll find everything you need explained in the threads if you take the time to understand.
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