Nokia Lumia 920 hard reset
First try this to soft reset your Nokia 920 Lumia. Press and hold the Volume down and Power buttons until it vibrates, after that you have to release all the keys then phone will vibrate 3 times.
To hard reset your Nokia Lumia 920 using key combination
Turn off your Nokia Lumia 920. Press and hold the following buttons Camera + Volume down + Power until your phone vibrates, then release only the Power key and keep pressing the Camera + Volume down for a couple of seconds 4-5s.
- On the Start screen, tap .
- Tap Settings > about phone.
- Tap reset your phone, and then tap yes.