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Important information from the official N8 FAQ
(
http://europe.nokia.com/support/search?page=1&fullcontent=true&cat=support&cnt=1&qt=n8+reset)
You should not use the "three finger" reset (pressing volume down + camera key + menu key and pressing power button) to hard reset the Nokia N8-00 device. Doing this will delete some applications (Ovi Store, Ovi Maps, some preinstalled widgets) which cannot be restored.
If the device needs to be reset, try the following methods instead of the "three finger" reset:
1.Press down the power button for 8 seconds.
2.Restore the factory settings by selecting Menu > Settings > Phone > Phone management > Factory settings > Restore.
The "three finger" reset should be used only as a last resort if the device cannot be booted up in any other way.
If successful, the device can be used after the reset but some of the applications are missing. The device needs to be taken to a Nokia Care point for reflashing to get the original applications back in the device.