A master reset will result in the loss of all data stored on the device including 3rd party applications.
This type of reset should only be used as a last resort after all other troubleshooting steps have been exhausted. It is highly recommended that you complete a backup of the device information and disable Device Protection before proceeding with the steps in this tutorial.
With the device turned off, press and hold the Volume down key.
With the Volume down key held down, press and hold the Power key.
Release the Power key when the ZTE logo appears.
Note: The previous Google username and password will be required to set up this device if you do not disable Device Protection.
Release the Volume Down key when the Android system recovery screen appears.
Use the Volume down key to scroll to wipe data/factory reset.
With wipe data/factory reset highlighted, press the Power key.
Press the Volume down key to scroll to Yes -- delete all user data.
With Yes -- delete all user data highlighted, press the Power key.
Once the wipe is complete, with reboot system now highlighted, press the Power key.
The device will restart.
The device is now reset and ready for use.