try mo muna hard reset
Master Clear/Reset Cricket Origin reset ZTE V768 ,
1. Make sure your phone has been powered off.
2. Hold down Volume up key and press Power key at same time until the screen lights up.
3. Press Home Key to access Android System Recovery screen.
4. Press Volume up\down key to locate wipe data/factory reset, then press Menu key to access factory data reset menu.
5. Select Yes-delete all user data, then press Menu key to confirm wiping data from the phone.
6. When finished, select reboot system now, then press Menu key to restart your phone.
Every data will be erased!