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The following article was found on
http://en.kioskea.net/faq/470-how-to-reset-your-nokia

Hard Reset
It may happen that despite you have restored your mobile to factory setting, the error still exist. In this case, it is recommended that you opt for Hard reset

Enter the code: *#7370# and press Yes to confirm initialization.
Important Notice: It is recommended that you save all important information on your phone (e.g: memo, contacts etc)
To make a Hard Reset on a Nokia phone that is not willing to turn on, just press simultaneously these 3 buttons:
on/off + * + 3
Before making a Hard reset better backup all your important information: contacts , memo…etc

Updating the firmware is possible with the following command *#0000#