Samsung mobile phone is upgraded on mobile phone. What if the phone doesn't respond?

If the mobile phone cannot enter the system after upgrading, it is suggested that:

1. Restart the machine: press and hold the power button and volume button for more than 7 seconds at the same time to restart the device; If it is a mobile phone with detachable battery, press and hold the power button for 8- 10 seconds to restart the machine.

2. If it doesn't work, try to restore the factory settings after entering the safe mode: when the Samsung LOGO or operator screen appears on the machine boot screen, press and hold the volume button (some mobile phones will enter the safe mode by pressing and holding the menu button in the lower left corner), and then back up the data in the machine to restore the factory settings.

3. If the machine cannot be started, it is recommended to connect the machine to the charger and try to start it again.

If the problem still exists, it is recommended that you take the purchase invoice, maintenance card and machine to the local Samsung service center for professional engineers to help you test.