“ Originally Posted by mike0122 
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Update I installed that 1 gig map to my sd card today and then opened up GMXT and finally I have the detailed map of the US. Everything is working now but if for some reason it stops I will uninstall that sw.unl file and reinstall Garmin. Maybe because I just had the software unit ID thats why the other maps didn't work but sense that 1 gig map did I'll leave it alone for now. I can't thank you enough PsyChoTK for the help.
the sw.unl file is the serial number for your card. if you delete it, you have to generate another one and drop it into the garmin folder. also there is a map id .txt file. my map id is 425. i can't say if it will help but drop the attached txt in the garmin folder and let me know if it works.