There is a jumper link on the main PCB (labeled something like "Memory BK"). It's on the right hand side of the board. You need to down power the panel completely, open the wire link above, re-apply power and close the link. It should now be returned to factory settings, just be advised that this will completely wipe ALL programming. Be warned, if you haven't programmed a Galaxy alarm panel before, then a 504 is probably not a good place to start!
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