I'm trying to update the maps for the Garmin GVN 54 GPS that is in my 2014 Aston Martin Vantage. With the help of the forums, I was able to update them to 2023.10 but the same process I used for that isn't working for the 2025.10 update. Basically, I downloaded the Canada/USA East map available from this thread, unzipped it to a file named gmapprom.img file, run that file through Garmin Unlocker Alternative with a seemingly successful result, then rename the file to gmapsupp.img and put that file onto an SD card with a FAT32 filesystem in a folder named Garmin. Unfortunately, the GPS doesn't seem to see the file, so it defaults to the original 2013 maps that came with the car. Fortunately, I did this on a SD card separate from the one with the 2023 maps so I'm still able to put that SD card back in and use them. I've tried different cards, but with the same result. Can anyone suggest what I might be doing wrong?