alright tried it with the resets (downgrade to 3.4 and do a reset insert my maps chips then upgrade to 4.2 and do a reset and insert my map chips) and I get the same scenario. it works fine at 3.4 but once I update and insert a different TrakMarine card (a card that wasn't inserted while at v3.4) it doesn't accept it "map format not supported". but to cure this all i need to do is insert them all while at 3.4 then update and they will all work.