Hard Reset ZTE Blade A450

First method:

1. First of all, turn off the device by holding the Power button.
2. Then press and hold Power + Volume Up button.
3. Release held keys when you see an Andoid image.
4. Then press the Power button to enter Recovery Mode.
5. Choose "wipe data/factory reset" by using Volume Down to navigate and Volume Up buttonto confirm.
6. Select "Yes--delete all user data". Use Volume Down button to scroll and Volume Up to select.
7. To restart the phone, select "reboot system now".
8. Success! The hard reset is done!

Second method:

1. Turn on the phone by using the Power button. 
2. After pressing the Home button go to Settings and then to Backup & reset.
3. Choose the Factory Data Reset.
4. Tap Reset Phone. 
5. Select Erase Everything if you are sure you want to clear all your data. 
6. Well done!

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