This guide will show you a simple way on :
How to factory reset SAMSUNG I9100 Galaxy S Ii .
How to wipe all data in SAMSUNG I9100 Galaxy S Ii.
How to bypass screen lock in SAMSUNG I9100 Galaxy S Ii.
How to restore defaults in SAMSUNG I9100 Galaxy S Ii.
All method of master reset SAMSUNG I9100 Galaxy S Ii.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG I9100 Galaxy S Ii will be as new and your core will run faster.