Xiaomi is rolling out a new software update for Mi 9 users in China. It comes with the Android September 2020 security patch update on MIUI 12 based on Android 10.
It optimizes system performance and improved system security and stability. It is rolling out on V220.127.116.11.QFKCNXM or V18.104.22.168.QFKCNXM for Mi 9 in China. You should be able to progressively receive the update over-the-air (OTA) on your phones via the Updater app, otherwise, you can download the ROM packages in this thread below.
- Updated Android Security Patch to September 2020. Increased system security