Before attempting to reset your Dahua IP camera, ensure you have the following:
For cameras that are still accessible but have a functioning password, the ConfigTool offers a straightforward factory reset option: how to reset dahua ip camera without reset button better
When all else fails, Dahua's technical support team can assist with password and factory reset procedures: Before attempting to reset your Dahua IP camera,
4. The Advanced Hardware Method: Internal Motherboard Jumpers how to reset dahua ip camera without reset button better