i have truck on my 520t ,works fine
i want to copy the sd card onto another sd card and use it in a different unit.
how do you change the unit id number to match the other tomtom.thats all i want to do
i get sofar then i end up seing the new unit id on 1 line and my unit id on another.
any help please 
i think you’d have to start again or at least delete the .dct file and generate a new key as well as patching the new device