Hi,you can make use of either soft reset,hard reset or factory settings.
will clear pending errors and bring your mobile
to an initial state by restoring Factory setting. To operate this
function on your mobile, the shortcut is: *#7380#
This function apparently works on almost all nokia mobile phones.
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.
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:
whenever you forget your security code the only option left to keep making use of the phone is to format it and the steps to take in the formation is to follow them below,
3.RESTORE FACTORY SETTINGS
4.YOU WILL BE ASKED TO ENTER PHONES FACTORY DEFAULT CODE
5.12345 OR 00000
wish you good luck,