DSC installing used keypad- caused alarm, function not available

How do I reset a keypad that’s been already programmed?

I bought it used and it’s caused the alarm to go off- hours after arming (so it must be something that was pre programmed). I was able to get into *8 but it doesn’t allow this function anymore and I didn’t do anything to cause this. Rather strange.

I don’t want to reset the panel obviously just the keypad (it has zone labels pre programmed as well).

Since pulling the power the general service trouble code is on and I can’t get into *8 to reset it. Could the keypad be defective?

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