If you set up your device using a Samsung account, you can use SmartThings Find to reset your device. First, navigate to the SmartThings Find website and log in with the same Samsung account used on your locked device. Use the menu on the left side of the screen to choose your device from the list.

It may take a few seconds for SmartThings Find to locate your device. The device must be powered on in order to be located.

Select Factory reset device. Review the information, and then select Next. Verify your account, and then select Reset when prompted. Select Erase. You can select Security Checkup to perform a device checkup if desired. 

The device will be reset, and you will need to go through the initial setup. Make sure to sign into the same Google account so that you can restore any backed up data.

First, open the Power menu:

• On devices with a regular Power button, press and hold the Power button until the Power menu is displayed.
• On devices without a dedicated power button, swipe down with two fingers from the top of the screen to open Quick settings. Tap the Power icon at the top of the screen.

Touch and hold Power off until the Safe mode icon is displayed. Tap Safe mode to start your device in Safe mode. If you've entered Safe mode successfully, you'll see Safe mode displayed at the bottom of the screen.

Use the phone or tablet normally to see if the issue has been resolved. If the phone or tablet is operating normally, a recently installed app was most likely causing the issue.

• If the issue is gone in Safe mode: One of your recently downloaded apps was likely the cause of the problem. Proceed to Step 4.
• If the issue still exists: Downloaded apps may not be the cause of the problem. You may need to reset the phone or tablet to the factory setting.

One by one, uninstall any apps you downloaded just before your phone or tablet began having the issue.

After uninstalling each app, restart the phone or tablet and check if it is functioning normally.

After you uninstall the app that caused the issue, you can reinstall the other safe apps you just deleted.

First, open the Power menu:

• On devices with a regular Power button, press and hold the Power button until the Power menu is displayed.
• On devices without a dedicated Power button, swipe down with two fingers from the top of the screen to open Quick settings. Tap the Power icon at the top of the screen.

Tap Power off to turn off the device. Wait until the phone or tablet completely turns off, and then press the Power button again to turn it on. See if the issue has been resolved.