Do you have a backup from when you bought it to check if OEM map version was Unicode or not?
Otherwise, go to the map Updates page again this time with the 3790 connected and click 'Device Content'. If it has OEM non-unicode it will show 'Europe NT' like the first screen below, if unicode it will be 'Europe NTU' as in the second for the dezl 760:
[Only registered and activated users can see links. ] [Only registered and activated users can see links. ]
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