ZTE E810 soft reset
You can reset your ZTE device's password: Turn off your phone, then turn it on. Select emergency dial. Input *983*987# in emergency dial-up pad. It will restore factory settings and your personal data will be erased.
Reset Hole Use a needle-like object to insert and press to restart the phone. Reset hole is located at the lower right side of the ZTE E810 phone.ZTE E810 hard reset
ZTE E810 hard reset solution Press and hold both Home + right button (above the key) + Space + Power

or
Settings > Reset to Factory Settings
Select Reset To Factory Settings. Follow the instructions displayed on the screen to
reset the phone. The phone will restart after reset.
Warning! After you reset your phone to factory settings, all the information and settings you have
saved on your phone will be lost.
Press "Start"
Scroll to Settings, press the Centre key
Scroll to More, press the Centre key
Scroll to More, press the Centre key
Scroll to More, press the Centre key
Scroll to Reset To Factory Settings, press the Centre key
Enter 1234, press "Yes".