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Remove the battery, than just blow a gentle hot air to the back side of the mobile(motherboard). Ensure that it does not over heat. when the whole board is little warm. wait for some time and then put the battery in and turn on.
dial * 7370# and *7780# one after other every time phone ask for security code and restars and formts it self . if u dont know the security code switch off hte phone hold *,3 and green dial key togetehr and switch on the phone without relesing it for 15 sec even after power on . then phone will start formatting
care full battery must be fullly chrged
check your buzzer if it was still ok, using tester set it in X1 if the buzzer creates sratch sound if you connect your testprove in the terminals of your buzzer it was ok but if you cant hear any sound, it was defective, so you have to replace it. good lack........