Hard Reset ZTE Grand Memo V9815

1. Remove and insert the battery into your phone.
2. Please unplug any USB or power cables from the phone.
3. Then press and hold Volume Up + Volume Down + Power button together.
   
4. Release them when the red Motorola logo appears.
5. Now you will see Android logo -> press Home button.
   
6. Scroll down to the option "wipe data/factory reset" using Volume Down to scroll, and Power button to confirm option.
   
7. After that choose option "Yes-delete all user data".
8. Afterwards select option "reboot sytem now".

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