How to factory reset NTT 309B? How to wipe all data in NTT 309B? How to bypass screen lock in NTT 309B? How to restore defaults in NTT 309B?
The following tutorial shows all method of master reset NTT 309B. Check out how to accomplish hard reset by hardware keys and Android 4.2 Jelly Bean settings. As a result your NTT 309B will be as new and your Cortex A7 core will run faster.