Another thing: Mi5 has android 7 from a few wekks. If I good remember, Redmi 3s got android 6 about two-trhree month ago, so I don't think, Xiaomi will update this device.
So this article is strange.
It's stupid.
Mi4c/Mi4s will get android 7 for a few weeks.
Here is screen from beta: http://www.miui.com/thread-7089197-1-1.html
Don't belive in everything you can read into Internet.
I have Mi4s, but display is terrible. When I have Nexus 4, I could calibrate display color. Is this possible to calibrate color in Mi4s?
Of course stock settings in MIUI ins't enough.