I found this tutorial from another forum and sharing it here. So the credit goes to jnx_r.
Step1:
First of all u need 2 have ur symbian phone hacked, a working version of rom_patcher installed and a file browser like X-plore or FileExplorer through which u can access private folders.How to hack your phone see below link----->
1)http://nokiaphonefirmware.blogspot.in/2013/03/hack-nokia-using-installserverexe.html
2)http://nokiaphonefirmware.blogspot.in/2013/01/install-unsigned-application-using.html
Step2:
Download the needed software:
1)RomPatcher----->http://www.symbian-toys.com/rompatcherplus.aspx
2)X-Plorer-------->i)http://www.mediafire.com/?t4s7gpbhbz0c96p
ii)http://www.lonelycatgames.com/
Step3:
1. Install Rompatcher using the below tutorial:
1)http://nokiaphonefirmware.blogspot.in/2013/03/hack-nokia-using-installserverexe.html
2)http://nokiaphonefirmware.blogspot.in/2013/01/install-unsigned-application-using.html
Open RomPatcher and apply open4all patch.
2. Run x-plore and then "MENU---> TOOLS--->CONFIGURATION" change the configuration to 'Show Hidden Files'.
3. Then goto C:\sys\data and you can see the file 'mmcstore'.
4. Open the file in the inbuilt hex-editor "MENU-->FILE--->HEX EDITOR" and you can see your password in the right column.
In my case my password is choclate
NOTE: We can find the 'mmcstore' file from the phone where the password was initially set. So by this method we can't unlock any locked mmc. :P:D