UPDATE: I'm still using "xiaomi.eu_multi_MIMAX3_V10.2.1.0.OEDCNXM_v10-8.1" on my Max 3 and it's working great.
I have found only one annoying bug: screen auto rotation is not working for some reason. (Yes, I have "Auto-rotate screen" option turned on). I can only force screen rotation with an...