First Alert Security System Setup Help

I just bough a house and have this First Alert System. I was messing with it and the alarm went off which I somehow managed to turn off. Question is, can someone help me find a way to master code or installer code so that I can actually use it? The last owners who lived in the house previously didn’t use it because it was installed by someone who lived in it before them. I have a FA110C

submitted by /u/JR2365
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