What to do if the Xiaomi Robot Vacuum S40 cannot connect to the network?

If the Xiaomi Robot Vacuum S40 cannot connect to the network, please refer to the following steps:
1. Ensure that the Wi-Fi password entered is correct. Wi-Fi usernames should not include Chinese characters or special symbols such as @, ¥, %, etc. If so, reset them to English or alphanumeric formats and try again;
2. Check if the router's external network connection is normal by opening a webpage on your phone or a computer connected to the Wi-Fi;
3. Ensure that the router and robot vacuum are within a reasonable distance (within 5 meters, without walls in between). Try moving the robot within 1-2 meters of the router to reconnect;
4. Try connecting via a mobile phone's hotspot;
5. Check if the router is overloaded with too many smart devices causing network slowdowns or non-responsiveness. Restart the router and try again;
6. The device does not support EAP802.1x authenticated networks, 5GHz networks, or public Wi-Fi networks requiring web authentication;
7. Check if your phone has restricted the APP's permissions, such as network access or location. Grant these permissions and try again;
8. Connection issues also can be related to the phone model. Try connecting with a different phone model;
9. Re-enter pairing mode and attempt to pair again.