What should I do if the 4g signal is unstable after the Samsung mobile phone updates the system?

It is suggested to take the following steps for investigation and handling:

1. It may be that the signal coverage of your location is poor, so it is recommended to restart your mobile phone or try to change a location.

2. Connect the mobile phone to the wireless network and update the device to the latest version.

3. If it doesn't work, please turn off the phone, take out the SIM card and try to insert it again.

4. Replace other SIM cards.

5. If the signal is still unstable, please back up the data (contacts, information, etc. ) and try to restore the factory settings.

If the problem still exists after the above operation, it is recommended that you bring the purchase invoice, three-guarantee certificate and mobile phone to the local service center for inspection by engineers.