How to factory reset TENGDA HD9800? How to wipe all data in TENGDA HD9800? How to bypass screen lock in TENGDA HD9800? How to restore defaults in TENGDA HD9800?
The following tutorial shows all method of master reset TENGDA HD9800. Check out how to accomplish hard reset by hardware keys and Android 4.2 Jelly Bean settings. As a result your TENGDA HD9800 will be as new and your MediaTek MT6592 core will run faster.