Sorry to revive up an old thread,
but i actually have the same issue now, the Uconnect wont load the Nav at all, just gets stuck in a boot loop and wont load the maps.
Does anyone know how, If it's at all possible, to get it onto mass storage mode? Pretty sure i put a bad Poi file or map in there somewhere.

* also noted that this guy hasnt posted anything since 2015 lol

Megs