Hard Reset ZTE Geek U988S

First method:

1. At the very beginning hold down the Power key for a short while in order to switch off the device.
2. In the next step press and hold Volume Up + Power button for a few seconds.
3. You can release held keys when you see an Android Robot on your screen.
4. Afterwards hold down the Power button for a short while to enter Recovery Mode.
5. Then choose "wipe data/factory reset" by using Volume buttons to navigate and Power keyto confirm.
6. Select "Yes--delete all user data". Use Volume Down button to scroll and Power button to select.
7. To restart the phone select "reboot system now".
8. Good job! The hard reset has just been performed.

Second method:

1. Firstly press the Power button, until your device is on.
2. From the home screen open Menu and choose Settings.
3. After that select Backup&Reset and tap Factory data reset.
4. Choose Reset phone and select Erase everything to begin hard reset operation.
5. Wel done! Your phone is ready to use.

Third method:

1. The device must be power off, so press and hold Power button.
2. Then hold down the Power key to turn the phone back on.
3. Choose emergency dial, and type the following number: *983*22387#
4. Then from the menu in front of you choose Erase Everything.
5. Good job! Now your phone should restart.

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.