This guide will show you a simple way on :
How to factory reset SAMSUNG R640 Character.
How to wipe all data in SAMSUNG R640 Character.
How to bypass screen lock in SAMSUNG R640 Character.
How to restore defaults in SAMSUNG R640 Character.
All method of master reset SAMSUNG R640 Character.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG R640 Character will be as new and your core will run faster.