My navigation is no longer working on my jensen vx7020 as I have only had the unit for about 5mths. When I click the navigation icon nothing happens. I called customer service and they want me to send in the entire unit. I really dont want to do that as this option would leave me without a radio. Any help would me much appreciated. I placed the sd card into my pc and the files on them are some of which I have never seen before. There are not listed file types for them and some are labeled in numbers like the number 2 and letters such as d, s, i, u. Attached is a copy
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