pin not working

My '16 Chieftain went to sleep, that is my key fob battery died. Replaced the battery and now not recognized by the brain. I don't have the master pin or a personal pin. Questions are; Doe's the brain need reset when replacing the battery in the FOB? Can I get the factory PIN from my dealer...

Without going to the dealer. I've done several searches here, too. A few days ago, at work, I decided to try my my PIN for the hell of it. No go. I also tried to reset it trying what I think was the master PIN, but that's not working, either. I'm almost afraid to go anywhere for fear of my...