Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well.
ZTE Blade hard reset
Remove SIM card. Power on the phone. Press "Emergency call" and dial / type in the following hard reset code for ZTE Blade *983*987#
Try this: HOME + VOLUME UP + POWER ON ZTE Blade for hard reset recovery menu.
Hard reset possible with flasing a new ROM / hr from recovery menu