This is how to factory reset the Nokia N8 and restores the device to its original factory default settings.
Factory reset:
1. From Main Menu go to Settings
2. Select Phone
3. Select Phone Management
4. Select Factory Settings then Delete Data and Restore
Hard Reset
* Turn off the phone.
* Press and hold the following Button keys:
o Volume Down button
o Camera button
o Menu button
Press the Power button until the phone vibrates....
Just wait until the phone reboot and the reset process completes.