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If, due to some reasons you have problems during OTA update of your box, you can use following instructions
Android 7.1.2 V 4.0.0b for Ugoos RK3288 Brand devices available now
Video with update processing inside
If you have problems with standard reflashing options, or your device had bricked
Here is Rockchip reflashing tutorial for those who has no Windows host PC and just obtain Linux distributive.