I have a Montana 750i and am trying to do a map update. Using the "Garmin Express" I see the "Map Update Available" and clicking on the install box, I get the terms and conditions screen and click on the accept box that takes me to the Important Notes Before We Begin and I click on the continue Box.Then I get a red box with a THERE WAS AN ERROR INSTALLING THE UPDATE. Yes I have a class 10 32G SD card installed and formatted in the 750i. Having spent time with Garmin Support both via chat and phone and have sent them files and pictures of what I have and been seeing it seems like support has no idea why. Yes I am still waiting for a response for them. Has anyone else had, seen this problem and if so how did you solve this.