Hi Gianni
may be a problem with that unlocked map? Download locked one and unlock it by yourself with gimgunlock+mapsigpatch.
[Only registered and activated users can see links. ]
Be sure to use NT map and not NTU version.
For "Map Source Data with msi installer" he means PC installation for Basecamp. Mapsource is discontinued and it's better to use Basecamp.
[Only registered and activated users can see links. ]
See some FAQ for newbies [Only registered and activated users can see links. ]
Scroll to: Have you downloaded a PC map version (.exe/.msi) for Basecamp/Mapsource?
to get info and links.
Basecamp uses Mapinstall to send .img to your device.
[Only registered and activated users can see links. ]

More here:
[Only registered and activated users can see links. ]