aqui tienes los pasos: primero renombra el archivo *.nbh por TOPAIMG.nbh
* Copy TOPAIMG.NBH into the root dir of your Storage Card.
* Be sure to have at least 30% of charge.
* Turn off your device by using the Power Button.
* Go to Boot loader mode. Push and hold Vol. Down + press Power button.
* After that your device with have a white screen with text " Press to power button for continue upgrade or Press Volume down button for cancel upgrade , select press to power button and it will start upgrade Rom.
y un vídeo: