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my xperia m dual is now running on safe mode and i'm unable to run my xperia m dual on normal mode
Simply restart your phone to get out of safe mode. Make sure that the volume down isn't pressed down during the start up since the volume down button will force the phone into safe mode.
You have a defective volume down button. Have it fixed at a sony service:
http://www.sonymobile.com/global-en/support/contact-us/