Check the network status to see if the airplane mode is switched on by mistake.Airplane mode will disable the WiFi function of the wireless module.Please use WIFI function as follows:
1. Click the icon of WIFI network in the lower right corner, and the list of WIFI networks will appear
2. Make sure airplane mode is off and WIFI is on.
3. Click to select the appropriate WIFI and follow the system prompt to connect to WIFI. Enter password and connect.
Does it help?