This guide will show you a simple way on :
How to factory reset SAMSUNG Galaxy Tab 7.7 Lte I815.
How to wipe all data in SAMSUNG Galaxy Tab 7.7 Lte I815.
How to bypass screen lock in SAMSUNG Galaxy Tab 7.7 Lte I815.
How to restore defaults in SAMSUNG Galaxy Tab 7.7 Lte I815.
All method of master reset SAMSUNG Galaxy Tab 7.7 Lte I815.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG Galaxy Tab 7.7 Lte I815 will be as new and your core will run faster.