This guide will show you a simple way on :
How to factory reset SAMSUNG Galaxy J3.
How to wipe all data in SAMSUNG Galaxy J3.
How to bypass screen lock in SAMSUNG Galaxy J3.
How to restore defaults in SAMSUNG Galaxy J3.
All method of master reset SAMSUNG Galaxy J3.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG Galaxy J3 will be as new and your core will run faster.