I have a DHI-NVR4108HS-8P-4KS2/L running firmware V4.002.0000000.3.R, Build Date: 22/03/2022
Is there a newer update? I wanted to upgrade as I dont have a menu option to Upload Custom Siren Audio
Dont have an option Alarm->Alarm-out-port
Enter your serial number, it finds the NVR model and asks for the firmware you're currently running. Then emails newer firmware if found (or you're not running a custom firmware).