Perform a soft, factory, and alternate master reset of the device.
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INSTRUCTIONS & INFO
POWER CYCLE YOUR DEVICE: There are multiple ways to reset your device if you are experiencing issues. The first step is to power cycle your device. Press and hold the Power/Lock button, then select Power off. Select Power off to confirm. To turn the device back on, press and hold the Power/Lock button until the screen lights up.
RESTART YOUR DEVICE: If a power cycle does not resolve your issue, perform a device restart. Press and hold the Power/Lock button, then select Restart. Select Restart to confirm.
Note: If you are unable to access the screen to 'Restart' the device or if it becomes unresponsive, press and hold the Volume down and Power/Lock buttons simultaneously for 10 seconds, until the device restarts.
RESET NETWORK SETTINGS: Resetting your network settings deletes previously associated Wi-Fi networks, security passcodes, Bluetooth devices and cellular network data settings. From the home screen, swipe down from the Notification bar then select the Settings icon > scroll to and select General management > Reset > Reset network settings > Reset settings > Reset.
FACTORY DATA RESET: If you are still having issues with your device, you may need to do a Factory data reset (Master reset). This will erase all data on your device and restore it to factory settings. From the Settings screen, scroll to and select General management > Reset > Factory data reset > Reset > Delete all.
Note: A Factory data reset will revert the device back to factory settings. It will permanently erase all personal data, preferences, settings and content such as pictures, ringtones and apps that are saved to the device. It is recommended that you save (backup) important data before proceeding.
ALTERNATE MASTER RESET METHOD: If unable to reset the device using the above steps, try the Alternate master reset method. With the device powered off, press and hold the Power/Lock, Bixby Key, and Volume up buttons simultaneously until the Android Recovery screen appears.
Press the Volume downbutton until Wipe data/factory reset is highlighted, then press the Power/Lock button.
Press the Volume downbutton until Yes is highlighted, then press the Power/Lock button to begin the reset process.
When the Android Recovery screen displays again, ensure that Reboot system now is highlighted then press the Power/Lock button.