It's a given that we're all agreed on Garmin's programs via usb only looking as far as the GarminDevice.xml for the info it needs and for the very reason you've stated. I think what is the issue here is what info does MapUpdater/GE then use from the xml. It obviously 'reads' the Model Description, but does it then use that info to determine which additional files to dl to the device? [in Strephon's case the JCV file for his 1300 with splash of 1340-50]. I suspect it does, by looking further into the xml to see if the path for jcv is present and maybe further. Maybe there needs to be some synergy between the files paths, the Model Description/ID and even other info. So would Strephon be given the JCV file if he edited his modded splash 1300's xml to show his Model Description as 'nuvi 1390' for instance?