I've got the file as a CSV, as I've used it to upload to my UV-5R radios with no issue.
I just tried uploading the list from one of my 5R's and then saving it as and IMG, but then when I try to upload to the 5G, the upload selection is available, com port is correct,but it won't let me select radio manufacturer or model.
I'm starting to think that the firmware on the 5G is preventing me from modifying it. I may have to unlock it via the xml radioddity program first.