This guide will show you a simple way on :
How to factory reset SAMSUNG I100 Gem.
How to wipe all data in SAMSUNG I100 Gem.
How to bypass screen lock in SAMSUNG I100 Gem.
How to restore defaults in SAMSUNG I100 Gem.
All method of master reset SAMSUNG I100 Gem.
So Check out how to accomplish hard reset by hardware keys and through android settings. As a result your SAMSUNG I100 Gemwill be as new and your core will run faster.