I think all the AVOV boxes have a reset button at the rear of the box that reset them to factory settings.
The Online 4 has it at the bottom of the box and its called restore. Its small, toothpick size.
Reset button – Resets your AVOV TVOnline+ to its original factory settings when pressed and held for over 30 seconds. ( It will be a tiny switch, so don't press to hard and break it !!!! )
Updates are then pushed or automatically down loaded from AVOV when your box is connected to the internet.