Yes, unlike older Paradox lines, with the Spectra and Digiplex panels, you can access the master code via the installer code. Provided you know the installer code, press "enter" plus the installer code, then go into section
301, and type in your new master code, which will overwrite the old one.To default, provided the board is not locked, power down, put on reset jumper, power up with AC, wait a good 20 or 30 seconds, remove the jumper and you are back to factory....000000 is the default installer code. If locked, nothing happens at all (note you do NOT lose all settings except the installer code like the DSC panels, so there is no danger in trying to default)
You will find it's much easier to do everything with these lines of panels if you hook up and use the full LCD keypad
Hope that helps
RHC