How to factory reset ITEL S21? How to wipe all data in ITEL S21? How to bypass screen lock in ITEL S21? How to restore defaults in ITEL S21?
The following tutorial shows all method of master reset ITEL S21. Check out how to accomplish hard reset by hardware keys and Android 7.0 Nougat settings. As a result your ITEL S21 will be as new and your MediaTek MT6737M core will run faster.
itel s21 hard reset pattern lock remove - video