Zerschossen SD card

Did the reader needs only to my SD card of car navigation update. During the first copying process, the device parted without intervention independently and suddenly from the PC, so to speak was ejected ... and obviously destroyed my SD card navigation.
Unfortunately, part of the update was the (first) backup software side and came quasi also not take place.
Even after manually copying tests on another computer (laptop with built-in card reader) with original manually backed-up data did not lead to If. Content could be produced at first sight again, but unfortunately the card is no longer recognized by the car.
Since now there was nothing to lose, I tried again the card over the reader to connect and copy data, but also because the connection was lost for the umpteenth time.
'm Really pissed off because I obviously imminent some phone calls with TomTom as well as a visit to the grade obvious dealership.