Hard Reset Sony Xperia V LT25i by using menu

 Turn on your phone
  1. Make sure battery is full.
  2. Go to menu: Setting > Backup and reset  > Factory Data Reset > Reset Device
  3. Choose Erase Everything
  4. It will start process to restore Factory mode, wait for several minutes.

Hard Reset by Code

 Make sure the battery fully charged
  1. Backup all your important data
  2. Power on
  3. On dialer enter this code: *#*#7378423#*#*
  4. On the screen Select -> Customization Settings
  5. Then select -> Reset customization and confirm.
  6. wait for several minutes.

Hard reset by button

  1. Switch off your cell phone.
  2. Next hold and press Power button + Volume Up for about few seconds.
  3. Follow the instruction