Nav seems to not only lost maps but also the garmin buttons as well. says no image available in small letters repeated over and over on screen along with the regular garmin nav warning in small letters as well. nav will not work at all. i have opened the unit and removed the sd card. checked it and it only has 4 files on it. gmapsupp.unl, grmn0.gma,
gtm_nvm.dat, and UnitID.dat . i have no idea where to go from here. any help would be greatly appreciated.
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