| Issue | Workaround / Fix | |-------|------------------| | Lost IP cameras after upgrade | Re-add cameras using ONVIF or manually re‑enter credentials. | | Web interface shows “Plugin missing” | Enable HTTPS + use Edge in IE mode, or install the local VSPlayer plugin. | | Motion detection sensitivity changes | Reset motion detection areas and re‑calibrate. | | HDD not detected | Power off, reseat HDD, then perform a via storage menu. | | No audio on H.265 streams | Switch camera to H.264 temporarily, or update IP camera firmware. |

A common repository for Hisilicon-based DVR/NVR firmware is available on Unifore , though this site also hosts the slightly older V4.02.R11 version. 3. Installation Methods