hello have there a question I wanted my navi from the Volvo upgrades have kept me to the instructions have the card material for Europe downloaded to a usb stick after which I finished true I put the stick in the middle console of the car the updat started to suddenly after the update has started playing up everything went as far as it was all right suddenly came the message usb stick is not recognized I’ve pulled out the stick out and since the start of the navi and it comes the message navi starts nothing more what can be lying thanks for jiede help