Here is the trick for complete formatting of your virus infected or other problem arriving mobile phone...

This trick is for almost all Nokia models.

1. Switch off your phone...
2. Remove SIM card & memory chip...
3. Now press & hold keys - 3,*,call green) ...
4. Then without leaving these three buttons press power button...
5. Formatting task will be started...
6. Remember its a very rare trick....

Yes its true its call hard format.

key * , 3 , Call button (green) press and hold when display is on than formatting screen is displayed.

Wait for formatting to be finished,