unlock ZTE Avail Z990 hard reset:
Turn off ZTE Avail Z990. Just hold the volume up key + power button + the options button (3 lines button on the bottom left) all together then the android screen will come on and select the master reset wipe all data. (you select with the back arrow button on the bottom right) and then scroll down to YES delete with the back arrown button again and then reboot phone and ur done! All data will be lost! Back up your data before doing hard reset!
or hold volume up+power+option you will get the android screen drag down to reset using down vol key
confirm with rotation key
Reset through menu Privacy: Reset to Factory Settings
Press the Menu Key or enter menu > Settings > Privacy > Factory data reset > Reset phone > Erase everything.
WARNING: All your personal information and downloaded applications on your phone will be erased
after resetting the phone.
Here are the steps for doing a master reset using the hardware buttons for the AT&T Avail
• Remove memory card
• Emergency Calls