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Hard Reset SONY XPERIA SP (C5302/M35H) & (C5303/C5306 LTE) with Hardware Key Button:
  1. Make sure the battery fully charge
  2. Do not forget to backup all important data
  3. Turn off the SONY XPERIA SP (C5302/M35H) & (C5303/C5306 LTE)
  4. Press and Hold together: Power Button + Volume Up Button for several seconds
  5. Follow the menu at LCD screen to continue the hard reset SONY XPERIA SP (C5302/M35H) & (C5303/C5306 LTE)