I bought a Peugeot 207 sportium which has a built in Clarion nx501 as standard. i updated the system but it has corrupted the navigation files on the original SD card, and therefore the navigation system does not work. does anyone know what i can do in order to get my navigation up and running in the car. Clarion will not help and have stated that it will cost me £200 for a new SD card with the navigation files on it.