Do you want RNS315 SD card reuse ?
To unlock/lock SD card without loss of data?
Yes it is possible with this device
Simply press the unlock button, delete deviceid file, press the lock button and it's done You can reuse in other navi unit as new
It is also possible to read CID of locked/unlocked card in PC using this circuit.
I can find the right password...
I build these circuits and send to the whole world...
So, if you have interes about this device write me...
Video : http://www.strihanividea.cz/andy.mp4