The latest update is still based on Android 9 Pie. The device was scheduled to get updated to MIUI 12 in the third batch phase of the rollout. Some users have already reported receiving MIUI 12 on their devices.
The firmware version of this update for Redmi S2 is V188.8.131.52.PEFCNXM and users have to download an 837MB software package to install this update. You can also download the update from the link mentioned below.
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