User manual

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Press and hold the Power and Volume Up buttons: If the phone isn’t
responding, press and hold the button combination for at least eight seconds
to force restart your phone.
When phone is off
Press and hold the Power and Volume Down buttons: Phone will enter
Recovery Mode, which does help to update the system, wipe data, check disk
and more.
Press and hold the Power and Volume Up buttons: Phone will be force
restarted. Press and hold the two buttons until your phone is turned on.