have you ever tried to do a factory reset on your phone and you are told to input password, sometimes the default password might be change and you tried different password but known work,you have no option than to flash the phone. you are wrong you can restore the default settings of a symbian phone even if you don't know the password, click on the link below to read more
https://abu4risay..com/2018/01/how-to-restore-symbian-phone-without.html