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There is an option called "Master reset" in "settings" menu.Remember to take propper backups before doing master reset because it erases all the user entered data.If you want a full cleaned state,try a software update.You can find all the necessary softwares from SonyEricsson's official web site.Note that you have to take propper backups before doing a software update
The one thing you can do is to try security code instead of lock code. If it doesn't work, take it to SSC ( Sony Service Center ), they will update and completely reset the phone. The code will also become default and the default code can be obtained in the manual. If you don't have the manual then it can be easily provided by the Dealer.
Thank you Sir,
Have a nice day.
The master reset will fix it, at least temporarily. A better solution would be to upgrade the firmware through the Sony Ericsson update service but this isn't working for me (Three UK) at this point in time.
Make sure you back up anything you don't want to lose if you go down the master reset road!