mmcs satnav problem
 

Hi im a new member of your forum and i have a 2013 outlander GX5 with the mmcs w-12 head unit, I recently had my car in a local non mitsibushi dealership for warranty work and now my sat nav no longer displays the road names of sidestreets on the map only main roads. I have check all setting in the nav menu, tried using the zoom buttons and also removing and reinserting the sd card with no success. Does anyone know how to resolve my issue, thanks for any any advice given mark.