Your device freezes or has fatal errors
Installed applications may cause errors. In this case, enter Safe mode and then delete the latest applications you have installed. To enter Safe mode, press and hold [ 
] until “Safe Mode” will appear while the device is booting.
If this does not solve the problem, perform hard reset in one of the following ways:
•From the Home screen, open the application list and select Settings → Privacy → Factory data reset → Reset phone → Erase everything.
•When the device is turned off, simultaneously press the Volume key down and [
], and then
press [ 
]. When the “Recovery MODE....” message appears, press [ 
] to reboot.
Hard reset removes all installed applications and data stored in your device and resets all settings back to factory preconfigured settings. But this will not reset the selected language.
troubleshooting
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