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How to Factory Reset from menu on ZTE Z820 Obsidian LTE?

  1. The device must be on. 
  2. Open "Settings" and then select "System".
  3. Next press "Reset options".
  4. Go to "Factory data reset".
  5. Click on "Reset Phone" to confirm.
  6. Tap "Erase everything" to finish the process.
  7. That's all! After these actions, your device data will be deleted.

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