User Manual
Page 183
... still perform a factory reset by using phone buttons If you cannot turn on your phone or access the phone settings, you do a factory reset. In case your phone has a persistent problem that cannot be solved, the last resort is not performing properly, or your phone becomes unresponsive, try restarting your phone...
... still perform a factory reset by using phone buttons If you cannot turn on your phone or access the phone settings, you do a factory reset. In case your phone has a persistent problem that cannot be solved, the last resort is not performing properly, or your phone becomes unresponsive, try restarting your phone...