Hard Reset ZTT Feature Phone F139

How to factory reset ZTT F139? How to wipe all data in ZTT F139? How to bypass screen lock in ZTT F139? How to restore defaults in ZTT F139?

The following tutorial shows all method of master reset ZTT F139. Check out how to accomplish hard reset by hardware keys and Vendor settings. As a result your ZTT F139 will be as new and your   core will run faster.

First method:

  1. Power off the phone.
  2. Next turn on the device.
  3. Choose emergency dial, and type this: *983*22387#
  4. Select from the menu Erase Everything.
  5. Well done!

Help! This doesn't work