Download latest KitKat 4.4.2 stock firmware for CX-S859 TV Box from here or here. Download previous firmware from here. To flash firmware on this box from PC via AMLogic USB Burning Tool read this article.
Firmware details
Archive： S859_S805_DDR1G_WIFI6330_-210320015
Model: CX-S859 TV Box
Archive size: 485 MB
Platform: Amlogic S805
Image: S859_S805_DDR1G_WIFI6330_sdk0823_pach_userdebug-s859-201503211115.img
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
Image: S859_S805_DDR1G_WIFI6330_sdk0823_pach_userdebug-s859-201503211115.img
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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