Please follow the below steps:
1. Go to Settings>Network & Internet>Internet>Wi-Fi and toggle the Wi-Fi switch.
2. Please turn on and off Airplane Mode, and try to turn on the Wi-Fi switch.
3. Restart the phone and try to open Wi-Fi normally.
4. We recommend you restore the factory settings after backing up the data.
If the issue persists, contact the Nothing Support Team for further assistance.