（1）Remove the memory card, power off, and restart the router and camera (no need to reset), then confirm whether it can be online.
（2）If the problem still exists, delete the added cameras in the APP, reset the camera, and re-add.
（3）When the camera is online, Please confirm the APP and camera firmware is the latest version.
Note: If there is a red spot in the Firmware Update, it means the firmware is upgradable.