Hard Reset ZTE GD180

Start by pressing Power button, device must be working to succeed this operation.
There are two ways, you can open phone's Dialer or go to Standby screen.
Now enter this code in: *983*22387#
Factory reset must be confirmed to do it press Yes.
Phone now must reboot to succeed operation so wait patiently.
Done, you can work on device properly.

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