Thank you, Catymag

In fact, I did NOT made myself clear:

The 3970T was working perfectly when it came out of the box: I used voice command and it connected with my blackberry for phone calls.

So, I believe that I've got an actual (not basic) 3790T.

The problems of lost feature occured after I "upgraded" (stupid thing to do, I know now) using GarminMapUpdater.

This what I need to recover from.

Thanks

Adding:

Good thing is hat I remembered having a backup of the nuvi made on May 23rd.

The backup folder has all the sub-folders, like .System, Demo, Garmin, ... Voice,

plus files: .sun; .VolumeIcon.icns; nuci_drive.ico

Important questions:

What I have to do is just the opposite of the backup ?
I mean: just use Windows to copy everything back ?

Any special considerations ?

Thanks !