Yes I did this but I cannot hear the sat nav working! It is like freeze at this screen! But it gives me that note and when I push the right knob this note (that the software will be loaded) disappears! I also tried to install v 18 but it does the same thing! I dont know what to do! When I load the software I must be to the "Menu" section or not? The radio and the monitor should be off?I have a markIII SatNav with 3-1/21 system software.My version is 16.2. Can I go to v28 directly?