2 - I don't believe seller have proper tool to activate maps on random SD-cards like TomTom does
1 - definitely You have NOT activated maps on Your SD-card - so TomTom reports about it in this strange way. Mostly it does so when there's no file *.dct inside the map - else it will report "You can't use the map... on this device"if I search the route directory (connected to Computer), the Maps are definately there.
I am going to the USA shortly, and need this to work.
Can anyone help ?
2 - go to 7 simple steps to update your device with the latest map
3 - proceed with step #6, bear in mind "the root of the device" - in Your case is the root of SD-card.