With the Garmin connected to the computer I used Windows Explorer to look at the files on the GPS. I then backed up all the files to my computer just in case. I then found a file called "gmapprom.???" that was almost 1 gig in size. That is the actual map file. I deleted that and then used MapInstall to add all the maps. I added all the US and Canada and had room to spare in my Nuvi 750. It took over an hour but had no problems.
I know that I am not able to upgrade my Garmin GPSMAP 76S hand held as it has been discontinued for a number of years and does not contain the memory that the newer units have.
What model are you trying to upgrade? What version of maps did you already have installed in the unit?
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