Hard Reset ZTE Vodafone 547

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.

Second method:

1. Switch on the cell phone.
   
2. Now from the home screen choose: Menu -> Settings -> Privacy -> Factory data reset ->Reset phone -> Erase everything.
3. Then your handset will reboots.

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