This guide will show you a simple way on :
How to factory reset SAMSUNG Galaxy J7 Duo.
How to wipe all data in SAMSUNG Galaxy J7 Duo.
How to bypass screen lock in SAMSUNG Galaxy J7 Duo.
How to restore defaults in SAMSUNG Galaxy J7 Duo.
All method of master reset SAMSUNG Galaxy J7 Duo.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG Galaxy J7 Duo will be as new and your core will run faster.