When running your card through xncs it will prompt you to install ghost,click yes then dump card.
This will enable you to check the bdo keys and make a note of them,some people suggest changing them to something like all 3's but I find it best to leave original and just enter them when prompted in Nagra.
The bdo keys are located in eeprom C040,C050 and C060 (somebody correct me if I'm wrong).