http://uov5vlsywysdx44mykfwhezqazyubs7zyqdrsl7iaawwrtkkdaig5xqd.onion/articles/KIIProAdventures
This TV Box's SoC is pretty well supported by many GNU+Linux
distributions, and Amlogic themselves made a kernel that supported their
SoC. The KII Pro isn't the only TV Box using the Amlogic S905 series of SoCs.
In fact, there are many other TV Boxes using a similar SoC. As such, many
people succeeded at running U-Boot and a Linux kernel on some of them.