Connecting a First Alert Fire and Carbon monoxide Alarms

Ok, So i live in the US I have four First Alert Fire and Carbon Monoxide detectors in my home, I have had all of them connected to Smarthings before I have a V3 hub. About two months ago I woke up to EVERYTHING on my hub disconnected. I had to reboot my hub, now I can’t get any of my First Alerts to reconnect. I have factory reset each of them, I have excluded them. And I have had them trying to connect sitting right next to the hub. Are there update device handlers I need? Can anyone help

you did a GENERAL EXCLUDE from the NEW HUB v3? before pairing to new hub?

That worked for my old Zcombo’s. They were just recognized as the existing type “Z-Wave Smoke Alarm”