Android 9 Update is out for Mi Box S. Updated both my units and so far so good. The only thing that’s bugging me is the voice lag on bluetooth headphones. If there’s a way to solve that then no other issues thus far. I use bluetooth headphones when i watch at night in my bedroom so it’s a big deal for me though. Hope it gets fixed in an update soon.

Can consider using the offline update method mentioned here :-

https://m.gearbest.com/blog/how-to/how-to-u...roid-9-pie-9092