Use your smartphone or computer that can connect to 5GHz WiFi to see if the CGO3 is transmitting its WiFi signal. The SSID to look for should be CGO3_xxxxxx, where the x’s are the last 6 characters of the camera’s MAC address (may be listed on a label on the camera). If you find that, try connecting to it and PW is 1234567890.
If you can connect with the phone or computer then the camera is not bound to the ST10/ST10+. If binding cannot be accomplished then there may be an issue with the 5GHz patch antenna inside the case of the controller. See this thread: Wifi not connected