I have tried all weekend trying to update the maps on my dezl 780LMT-S. Wasted a lot of time and data seeing it is a 7G file. This is the 9th time I've tried and everytime it throws an error and stops the download. Meanwhile using up all the data I have to run my trucking company. On top of it all, I can't use the maps that came with the device because when you update, it deletes the maps before installing the updated version.