Hello, I am using an Android Tablet from China which is Aigo Pad M80. Anyone of you have any idea of how to open the case of the tab?It does not have any screws or lock all around the tab to open the case. It has been repaired once and the same problems occur again. The whole rows of ports (USB,SD card reader,the earphone port) suddenly will not function in the same time. Can anyone help me?Thanks!