I got the file in the end from 1fichier.

Now I have the file I have run it and it has prepared an SD card.

When I put the SD card into my GPS map system nothing happens.

What am I supposed to do? I read somewhere about replacing the GCD file, but I'm not sure that's what I should do. I cannot connect to the GPSmap system with a PC as most of the guides seem to be focused on this method.