Hi,
We had a similar problem with Montana 5.6 firmware with the boot message "can't authenticate map" for CN Europe 2014-40.
But CN Europe 2014-40 was not seen in the sys info page as your North America map.
May be Garmin is developping a new anti-piracy device for Nüvis, or may be it's simply a firmware bug.
Montana 5.6 firmware was removed from download a few days after and replaced with 5.7 which can display all unlocked maps.
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