This guide will show you a simple way on :
How to factory reset SAMSUNG R680 Repp.
How to wipe all data in SAMSUNG R680 Repp.
How to bypass screen lock in SAMSUNG R680 Repp.
How to restore defaults in SAMSUNG R680 Repp.
All method of master reset SAMSUNG R680 Repp.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG R680 Repp will be as new and your core will run faster.