Hi all, I have a onda v811 and it has worked fine for the first few days. But now when I turn it on rather than having the usual boot screen a white android icon comes up and will stay on. The battery is fully charged and I have tried the reset button. Is there another way to return this tablet to factory settings? Maybe some key combination of power and home button? I believe it has the same buttons as the v711. Thanks in advance for your help.