1. Switch ON your phone with a non accepted simcard
2. Phone will ask you to Enter Unlock Pin
3. Input the 8 digit Unlock Code
Go to Settings > About > Reset your Phone (inster your lock code)
Turn off phone the Nokia Lumia 800
Press and hold the â€œVolume downâ€œ, â€œPowerâ€ and â€œCameraâ€ buttons.
When the phone start vibrates release the â€œpower buttonâ€.
Hold the â€œVolume downâ€ and â€œcameraâ€ buttons for more than 10 secs and then release them.
Nokia 800 will reset and turn on.
Press and hold the â€œPower onâ€ button for 10 seconds
The Nokia phoneâ€™s screen will turn black (the mobile is off)
Release the power button
You can turn on the Lumia now.