This information has been shared with all details and downloads links on the official MI community thread. If you want to know full details about the update like changelogs, please do visit the MI community thread. The full update file is around 2.2 GB in size for recovery ROM and around 3.7 GB for the fastboot ROM. If your device is running on a Global ROM, only then you will get the update via OTA. Otherwise, you have to install it manually. The update is based on Android 10. You can manually check whether the update is available in your region or not. Go to Settings –> About Phone –> Check for Software Update. 

Update Details (v11.0.9.0.QJWMIXM)

Device Name : Redmi Note 9S [curtana] Region: Global Software version: MIUI v11.0.9.0.QJWMIXM Android OS: 10 Security patch level: June 2020

Download Redmi Note 9S MIUI 11.0.9.0 (v11.0.9.0.QJWMIXM)

Recovery ROM  (Size: 2.2 GB) Fastboot ROM  (Size: 3.7 GB)

How To Install Redmi Note 9S MIUI 11.0.9.0 Global Stable ROM

Download the firmware file and save that in your device Now follow our manual flashing guide to install the ROM manually Redmi Note 9S MIUI 11 0 9 0 Global Stable ROM  Download v11 0 9 0 QJWMIXM  - 63