WARNING! Master resetting your smartphone will result in the deletion of all personal data stored on the internal memory, including downloaded content, custom ringtones, images and pictures captured with the camera, apps, contacts and more. Applying a factory reset will also return all settings to factory values, and it will remove all previous software updates applied to the device. However, data stored on the SIM and SD cards is not affected.

NOTE: Before proceeding, you can visit this thread in order to learn how you can back up and restore data on the ZTE Concord II.

Master Resetting via the Settings Menu:

  1. Tap "Apps" while on the home screen
  2. Go to "Settings"
  3. Swipe to "Personal" and tap "Backup & reset"
  4. Under "Personal data", tap "Factory data reset"
  5. Tap "Reset phone" and confirm by pressing "Erase everything"

Master Resetting via Hardware Keys:

NOTE: Assuming that you are unable to master reset your smartphone via the settings menu as described above (perhaps your smartphone crashes or freezes a lot) then you can still reset it using a combination of hardware keys, as explained below.

  1. Turn off your smartphone
  2. With the device powered down, press and hold the "Volume Up", "Home" and "Power" buttons at the same time
  3. Keep pressing the buttons until an image with an Android will appear
  4. From the recovery menu, press "Volume down" to navigate to and highlight "wipe data / factory reset"
  5. Press "Power" to select the highlighted option
  6. Use "Volume Down" to highlight "Delete all user data"
  7. Press "Power"
  8. When the device finished the wipe, the "Reboot system now" option will be highlighted
  9. Press the "Power" key one more time to confirm and reboot your device

Keeping Your Smartphone Updated:

NOTE: Once you apply a factory reset, all previous software updates will be lost. As such, it's highly recommended that you check for software updates as soon as your smartphone reboots after a fresh reset. To do so:

  1. Make sure your phone is connected to a Wi-Fi network
  2. Press "Menu" while viewing the home screen
  3. Tap "System settings" and swipe to "System"
  4. Tap "About Phone" > "software updates"
  5. Check for updates and follow the on-screen instructions if necessary, in order to download and apply the latest version of Android

See More: ZTE Concord II (T-Mobile): Master Reset and Check for Software Updates