I'm sure most experience users know this already, but some of us noobs are still coming to grips with QXDM. Let's say you want to find and edit the spc code on your Samsung phone and all you got is QXDM. You will still need your Samsung model password in order to do this. So here it is,

At QXDM Command output do the following;
password (enter here you 16 digit samsung password) - a message 'correct' should show
REQUESTNVITEMREAD SEC_CODE - this will show your spc code
REQUESTNVITEMWRITE SEC_CODE 000000 - this will change your spc to 6 zeros