Quelle: https://xiaomi.eu/community/threads/newest-weekly-mi2s.41010/The 7.6.8 has battery drain and overheating issues though. And generally, since more then a half year, the audio output on the Mi2S is broken in MIUI.
I still use my Mi2S as a daily driver and my advice for a good Rom is to use the MIUI v8.1.2 - that one is still bugfree.
Btw, it's sad that Xiaomi couldn't bring out a bugfree update for nearly 1 year...