You can either use an android app, like the (sketchy) MinerGate that you tried out on your blog, or, you can root your android tv box, and run Linux and mine from there. I tried compiling xmr-stak-cpu on my Android phone, running Ubuntu (armhf) through Linux Deploy, but I'm stuck when compiling (at the Make Command)
You can try it out. And maybe you can get a refund if it doesn't work out 😂

P.S. I find it pretty smart that you are using android tv box, those run arm chips, which are more power efficient, which decreases electricity costs