Hard Reset ZTE Boost Max

First method:

1. Turn off your phone.
2. Press and hold  Volume Up + Power at the same time for a few seconds.
3. Release held keys when you see Recovery Mode.
4. Then press Volume Down to select option "Wipe Data/Factory Reset", and press Power button to confirm.
5. Well done!

Second method:

1. The device must be turned off, so press and hold Power button.
2. Now press the Power button, and wait until the phone turns on.
3. After that choose emergency dial, and type this: *983*22387#
4. Then from the menu in front of you select Erase Everything.
5. Done! Now your phone will restart.

Third method:

1. Press the Power button, until your device is on.
2. Then from the home screen open Menu and choose Settings.
3. After that select Privacy and tap Factory data reset.
4. Choose Reset phone and select Erase everything to begin hard reset operation.

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