Are you using special characters in the password?
Maybe try another reset and then use the adapter. Set up an easy password. Reboot the camera. And then try to change the IP address.
Plug the USB adapter in to the computer.
Go into ethernet settings and using the IPv4 settings manually change the IP address to 192.168.1.100
Then power up your camera and wait a few minutes.
Then go to Edge with IE tab or INTERNET EXPLORER and type in 192.168.1.108 (default IP address of Dahua cameras) and you will then access the camera.
Tell it your country and give it a user and password.
Then go to the camera Network settings and change the camera IP address to the range of your system and hit save.
You will then lose the camera connection.
Then you will be able to access it on your network.