Why can't I find the Wi-Fi signal of the network device?

1. Check whether the Wi-Fi Switch is turned on or not. If it is turned off, please turn on the Wi-Fi Switch and try again. 
2. Check whether the configuration information of the upper-level gateway or the master network device is synchronized. If it is synchronized, you can directly use the Wi-Fi password of the upper-level gateway or the master network device to access. 
3. Only devices compatible with 5GHz networks can search for 5GHz wireless network names.