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sir just flash your mobile, Switch-off your phone. 1. Press and hold 3 keys; Green dial key, * Star key, no. 3 key on keypad and then press the power on/off to swtich on the phone. Remember, do not let go the 3 press and hold keys until you see a formatting word screen show! 2. After a few minutes when the Full phone formatting completed, your phone will back to original system and factory settting.
I am too facting the same issue ...Reverted back to def. settings ...uninstalled all unused / downloaded applications but still screen goes black when i slide the set in / out. and i cannot hear on head set..i need to sweitch on the speaker to make and receive calls all the time