Hello everyone, I'm new here. I got the box - CX-921 Rockchip Quad Core Android 4.2.2 OS RK3188T Cortex A9 1.4 GHz Mini TV BOX 2G/8G AV Output Built-in MIC Black several years ago. All of sudden this box does not reboot to the desktop, but only a wall paper displayed. I downloaded driver and firmware from this site and installed the driver to my computer. I connect the box through its USB-OTG port to my computer, but my computer cannot recognise this box, so I cannot flash it with my computer. Can someone let me know to flash the box? Thinks in advance!