This guide will show you a simple way on :
How to factory reset SAMSUNG Galaxy C5.
How to wipe all data in SAMSUNG Galaxy C5.
How to bypass screen lock in SAMSUNG Galaxy C5.
How to restore defaults in SAMSUNG Galaxy C5.
All method of master reset SAMSUNG Galaxy C5.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG Galaxy C5 will be as new and your core will run faster.