I tried what you said and there was no difference so I also changed the same two lines in ttgo.bif and saved the changes, I wasn't sure whether or not you meant me to do that in the first place, but anyway I am now able to use "Operate my Go" and it goes through the set-up procedure of selecting the language ec't until it gets to the screen to select a map, it then says there are "no maps found".
So basically it works but can't recognise the maps.
Nice try though :)
Anyway at least the truck navcore and maps are installed and seem to working OK thanks to what I've read of yours and other peoples posts on this site today.
Many thanks
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