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That's what I figured. We won't get 8.1 on this phone. Hopefully security updates will continue but maybe not because those are Android rather than MIUI updates. Thanks for the reply. I'm still relatively new to Xiaomi.
Android P is coming 20th August, now I'm wondering how much time Xiaomi will take before updating Mi Mix 2S, because they stated that they are already actively working on it from BETA Android P builds.