Bought tablet about 3 weeks ago from retailer in China. It powered on the first time. Tried to set the clock and it halted and got hooked. Used reset key. It powered on but I could enter my name and set the clock. Each time I tried anything else, the page would chage, so I could not achieve anything. Then it will not open beyond logo. Supplier sent me software to reflash it. Downloaded them to sd, and incerted it. Now it shows a splash about "Prepare enter mmc update mode. . . It does not go beyond that. What do I do?