This guide will show you a simple way on :
How to factory reset SAMSUNG Galaxy J4.
How to wipe all data in SAMSUNG GalaxyM J4.
How to bypass screen lock in SAMSUNG Galaxy J4.
How to restore defaults in SAMSUNG Galaxy J4 .
All method of master reset SAMSUNG Galaxy J4.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG Galaxy J4 will be as new and your core will run faster.