you downloaded from sourceforge ou androidfilehost?Actually on my Mi 9T I dirty flashed from 9.12.12 (with 78 Hz mod) and I have the January 2020 security patch for some reason.
As far as VoLTE goes - for some reason activating VoLTE breaks the microphone for me but that's an issue I've been having for a long time and not sure if it's ROM specific or carrier specific.
for me security patch is from december...dont know how you get january....
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