Nokia lumia 800 Hard Reset

Nokia Lumia 800 hard reset

Hardreset via Keys:
Charge your phone. Turn off your Nokia 800.  Hold Volume Down + Camera + Power
Release Power, but hold Volume Down + Camera for 5 secs. Release buttons
Phone will start with factory settings without prompting
First try this to soft reset your Nokia 800 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 800 using key combination

Turn off your Nokia Lumia 800. 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.
or

1. On the Start screen, tap .
2. Tap Settings > about phone.
3. Tap reset your phone, and then tap yes.