Don't have the password for my security system

Is there anyway to reset the password, without knowing the existing one?

When opening your panel and it states "enter id" try to put in 4321 or 6321.  It will probably let you in since those are installation ids and then once in you can change your access codes.  Let me know if that helps.  And if you know anything about how to get my siren to go off when i sensor is tampered with please let me know bc my system is not working! lol