Samsung C6712 Star II DUOS hard reset
Use this method to hard reset your Samsung C6712 Star II DUOS phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.
Menu > Settings > Reset
Reset various settings to the factory default values. Select which settings to reset. You must enter your device password
to reset the settings.
Your device freezes or has fatal errors
If your device freezes or hangs, you may need to close programs or reset the device to regain functionality. If your
device is still responsive but a program is frozen, close the program using the task manager. If your device is frozen and
unresponsive, remove the battery, replace the battery, and turn on the device.