This guide will show you a simple way on :
How to factory reset SAMSUNG S5560 Marvel.
How to wipe all data in SAMSUNG S5560 Marvel.
How to bypass screen lock in SAMSUNG S5560 Marvel.
How to restore defaults in SAMSUNG S5560 Marvel.
All method of master reset SAMSUNG S5560 Marvel.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG S5560 Marvel will be as new and your core will run faster.