In order to hard reset a ZTE Blade, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
ZTE Blade device will be brought back to the default configuration of a brand new device.
1. Switch on the device.
2. Press'n'hold the Volume Up and Power buttons.
3. Continue by selecting Wipe Data/Factory Reset - use Volume buttons to scroll to the option and Power button to select it.
4. Afterwards select Yes. Confirm with Power button.
5. Lastly, press Power button again, this time to select Reboot System Now.