| Problem | Solution | |--------|----------| | “Invalid serial number” | Double-check serial – it’s case-sensitive. No spaces. | | No reply from Dahua support | Try regional support: support.usa@dahuasecurity.com (example) or contact your local distributor. | | ConfigTool can’t find DVR | Disable firewall, connect directly via LAN, or use the DVR’s local menu to get the IP. |
For enterprise NVRs/DVRs that have completely failed GUI login, you can perform a via a serial console (COM port). dahua dvr password reset with serial number