Lenovo P770
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1st method

  • Go to menu or to notification
  • Click settings
  • Select Backup and reset -> Select Factory Reset -> Confirm
  • Select Reset Phone -> Erase everything -> Confirm

 

2nd method

  • Power off the phone
  • Press and hold Volume up (Red) + Power On (Yellow)
  • With Volume down (Blue) go to wipe data and select it with Power on (Yellow)
  • With Volume down (Blue) go to Yes and select it with Power on (Yellow)
  • Select Reboot phone now with Power on (Yellow)
Lenovo P770 Hard Reset
Lenovo P770 Hard Reset
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Let us know if worked by leaving a comment :)