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.

got LUMIA 920 with security code and both combinations
soft/hard reset key solutions not working???

this is the correct solution to remove password on LUMIA 920

Nokia Lumia with Windows Phone 8

Step 1
Make sure the charger is disconnected.
1. Switch the power Off.
2. Press and hold the Volume down and connect the charger, if succeed an exclamation mark (!) is shown on the screen.

(To cancel OS reset and exit to the normal mode, press the Volume Down + Power Key and hold them for 10 seconds).
Step 2
Then input Keys in the following order:
1. Volume up
2. Volume down
3. Power
4. Volume down
Step 3
The phone will reset and boot up automatically
regards