Mi Play is now getting the August security update globally. The update comes with the version number V11.0.8.0.OFIMIXM and is based on the Android Oreo. This is the first update Mi Play recived after May security update. You can give up on the MIUI 12 update because Xiaomi never mentioned Mi Play on thier MIUI 12 device list.
The update is in the initial rollout phase which means only a number of devices will get the update. The update then will be rolled out to all devices once the ROM confirms to be stable. However, if you cannot wait for the wider release, then you can download the ROM from the Download Section and install or flash it manually using the given Guide
Changelog
System
- Updated Android Security Patch to August 2020. Increased system security.
Download Section
Recovery ROM: Download
OTA Package (Upgrade from ): Download
How to Install/Flash The Update on your Mi Play
Using Updater
If you want to Upgrade your MIUI then Use this Method. Make sure to Download the OTA package only, Fastboot ROM will not work with Updater.
Done! You have flashed Stock Firmware for Mi Play