Hard Reset ZTE Grand S

First method:

1. Firstly, switch off your phone by using Power Button.
2. After that, press and hold Power + Volume Up button together.
3. When you see Recovery Mode menu release held buttons.
4. From the menu choose "Wipe Data/Factory Reset" by using Volume buttons to scroll andPower button to select options.
5. Then confirm the whole operation by tappinng "yes".
6. Good job! The hard reset is done.

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.

Third method:

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

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