Hi everybody, thank you all! After re-installed firmwares and tried different ones many times, I suddenly found a post mentioning that Silicone case is a bad one for MP5. I used Silicone case, but one day it seemed pretty wet. Finally I figured out that it is caused by Silicone case which makes the MP5 very wet during playing. This makes the touch screen not working at all. After these days, I have stopped using Silicone case and let it dry for a few days. Now it works!
Amazing....
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