1. Check if the camera is disconnected from the power supply, and make sure the original adapter is used;
2. Try to reboot the router;
3. If the device power supply and network are working properly, check the device indicator light:
Blinking blue: The camera is connecting to the network, if the Wi-Fi name or password has been modified, reset the camera, and connect again;
Blinking yellow quickly: Camera has been reset, re-connect it;
Solid yellow light: Camera ROM needs to be flashed.
4. Confirm whether the memory card is inserted into the camera. Pull out the memory card and check whether it is still offline, as some of the poor-quality memory cards may cause the offline problem of the camera.