unauthenticate means locked, so use an unlocker and dont add unl notepad file-
the only case you must add also the unl file is in case of cityxplorers maps for pid 2,to abilitate some features,
in 3790 use maps with modified PID 800 for pubblic transports and pedestrian mode, you''l find them in map index-
You have to navigate to get to the good.
Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600