Download latest Android KitKat 4.4.2 stock firmware for CS918G Plus TV Box
This firmware is for CS918G Plus TV Box with AMLogic S805 CPU 
Download latest Android KitKat 4.4.2 stock firmware for CS918G Plus TV Box from here or from here. To flash firmware on this box via AMLogic USB Burning Tool read this article.
Firmware details
Archive name: ROM-CS918G PLUS
Image: ugoos_s805_rtl8723_20140323_k5(8GFlash).img
Archive file size: 646 MB
Platform: AMLogic S805
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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CS918G PLUS