Hard Reset ZTE Link

First method:

1. Start by pressing Power button, device must be working to succeed this operation. 
2. Pressing Call key will open phone's Dialer.
3. Type in this code:  *983*22387#
4. Next confirm Factory reset operation by clicking Yes.
5. Phone now should restart, after that operation will be done.

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.