If your NVR is connected to the internet, you can update directly through the local GUI: DHI-NVR1108HS-S3/H - Dahua India
It is critical to download firmware specifically designed for the hardware revision. Using incorrect firmware can "brick" the device.
Corrects playback issues, storage errors, and device-specific anomalies.
Often adds improved compatibility with ONVIF and RTSP protocols for third-party cameras. Where to Download Firmware