Xiaomi Mi Mix 2 is receiving the latest security patch over MIUI 11 with other bug fixes. You can download MIUI 12.0.1.0 China Stable ROM for Mi Mix 2 which is based on Android 9.0 Pie and comes with software version V12.0.1.0.PDECNXM.
Talking about the MIUI 12.0.1.0 update for Mi Mix 2 Chinese variant, it brings the February 2020 Android Security Patch with improved system security. It also offers a stable MIUI version based on Android 10 along with some of the bug fixes and improvements that you can find below in the changelog. The firmware update bumps up a new software version V12.0.1.0.PDECNXM and it’s rolling out via OTA in a phased manner and will take a few days to hit all the units completely.
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Check OTA Updates Manually
Due to the incremental roll-out process, the OTA update can take a longer time to arrive than expected. It’s highly recommended to check for OTA updates manually via the device Settings >> About Phone >> Software Update. If the latest update is available, simply download and install it.
Alternatively, you can check the firmware OTA update via the Software Updater app on your Xiaomi device. Ensure that the device is fully charged and connected to a Wi-Fi network.