Hi, I have recently bought a Peugeot 207 with a Clarion NX501 unit in it. I can't select the navigation option on the unit as its not highlighted when I do press it it just beeps. I've taken the microsd card out and tried to connect to Naviextras toolbox, however this does not work. On my computer it tells me that the card has had 3gb of used space but it will not let me view the files. Does anybody have any suggestions as to what the problem may be?

Many thanks in advance