Format the device by dialling *#7370#. The device will request a security code, the default code is 12345 unless you have changed it.
Note that formatting will delete all user data from the device memory so always make a back-up to a memory card or use Nokia PC Suite.
i have problem with security code , my security code have been changed but i don't know. How can i reset original code or another code? Please help
ONLY way to get it Reset to the default 12345 is thru' Nokia Care. A proof of ownership (Bill / Invoice) may be asked...