- Soft Reset (*#7780#): This is a normal reset. It will load the original settings from the phone's ROM. However, it will retain the user's own data. Like images, music, installed applications etc.
- Hard Reset (*#7370#): This method completely reformats the C: drive (Phone Memory). All the user information will be deleted. Like images, music files, installed applications etc. Hence, the phone is set to the default factory settings.
Switch Off the device.
* Press and Hold down the keys Green/Talk + 3 + *.
* Switch On the device.
* If everything goes well then you will see "Formatting" screen.
On performing any of above methods of formatting the phone, device will ask you for a security/lock code. Default code is 12345
The link above will explain how to restore the phone to its original condition. This effectively reinstalls S60. It also wipes out everything else on the phone so be sure to use Noia PC Suite to back up what you need to keep and to restore it after the reinstall of S60.