Annun 1 No Answer NFS-640 with AMG

I have a Notifier NFS-640 wired to a AMG-1. Everything works just fine including the AMG but I get an annoying Annun 1 No Answer trouble. I have tried to strap out the ACS terminal using a 120 ohm resistor recommended by the manual but that trouble still remains. Any help would be greatly appreciated.

Power cycle the amg.

Someone told me that the AMG I have is not compatible with the particular CPU-640 due to the firmware version in the panel or that the panels ACS is “defective”. Since I don’t have access to VeriFire Tools I can’t upgrade firmware. Not sure if there is anything else I can do without a firmware upgrade or using it without voice evacuation.