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You have to install the branded firmware.
Search for it. Also,this is not called unlocking or debranding.
You are branding your phone with a new firmware.
If you want to debrand or unlock your phone you have to install generic firmware on it.
you can upgrade the firmware instead by downloading the "nokia software updater" from the nokia site given below it is free
first you must download that and then you can upgrade the firmware of your cell ...
NOTE: never disconnect or power off during the firmware update this will damage your cell phone completely and after that even if you visit the nokia also they cant help you with that , so while doing that do it carefully ..
thank you bye any doubts you can reply me i am always here to assist you please rate my solution have a nice a day
no!!don't use wotan cause i've searched for it in the net its no good...try to get the updating software in the sonyericsson website itself to be reliable..then use it to upgrade ur phone,,,for more information go to the link ""game operation failed" i have posted the complete detail there..