I got them added but when I try to open one or even the base map that's installed it says there is no application to open file... and it justill shows a blank screen on my unit.. the base map shows nothung. I'm trying to using Garmin maps it might not support it .. I have the 4.000000 software but I didn't back up myour unit before I updated it.. smh can u help or let me know what I need to do.. thanks if really appreciate.