I've just tested 9.6.20 on my Mi MIX 2S 8/256GB M1803D5XA model and I have the same 4G connectivity issues. 2G and 3G telephony is a nightmare. It's probably not xiaomi.eu's fault, though.
What a pity xiaomi.eu's camera app is not available as a standalone app (for both the Mi MIX 2S and the...