no maps sat nav

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since first update done 20 march following letter all ok suddenly at beginning of june sat showing wrong time ,not able able to update clock then whole sat nav went loopy. On return home yesterday took out sd card installed in computer to check for updates first of all said corrupt had to be scanned then no maps  in process of installing next update to usb stick waiting on car coming back from being in use   If I install the usb stick as per connect instructions with sd card in car slot will the maps return or must I somehow buy new?

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