I lost all the maps on my GPS and I don't know how it happened. I reset the unit but the maps didn't reappear. I checked dthe scripts and it showed a lot of the maps had been erased. I didn't erase them so I don't know how it happened. I downloaded Garmin Express but it won't work on my IOS. Purchased a new battery, replaced it after watching a video on youtube and still can't get past the icon charge screen on the unit. Very frustrated. Please help.