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The first thing for you to do is find a manual for the alarm panel, and see if it is password protected and cannot be reset. Most used alarm panel are locked with an Installer password by the monitoring company, and you cannot freely use and program them. It's kind of like a password protected and locked smartphone. If it's locked you will need a new PCB panel, but they could be as cheap as $75, but you may need new keypads that are compatible. After this there are too many possibilities for me to type out.
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