Hi all.
In new BEST update ( from v1.90 ) you can reset UserCode (Security code) to default 12345 just with one button.
No format required , if you need preserve PhoneBook, Calls, Messages, Files in phone.

HowTo :
Press "Reset UserCode" button in MediaTek tab. Follow software instructions.
After operation done - code will be default (12345).

This feature not harm phone user data, user settings or any security part and fully safe.

All MTKx Nokia phones are supported.