nokia lumia 830 hard reset

Hard Reset / Factory Reset will be remove all security code and others information. at first backup your impotent contact, message, photos, videos and others data before hard reset.

1. turn off your device first.

2. press and hold volume down button and connect usb cable with pc. after 9 second show exclamation mark (!) on display.

Press this keys
1. volume up

 2. volume down 

3. power

 4. volume down

after few second device will be restart.