Yes and no.
OPPO has stated that the device's 2019 hardware (Snapdragon 665) is no longer sufficient to support regular major upgrades like ColorOS 12 while maintaining performance. How to Check Your Current Version oppo a9 2020 coloros 12 update
It is always sad when a reliable phone stops receiving major updates, but the OPPO A9 2020 had a respectable run. It launched on Android 9 and ended on Android 11—covering over three years of feature development. Yes and no
The A9 2020 remains a solid backup device or a great phone for basic tasks, but its journey with major software updates has officially concluded. oppo a9 2020 coloros 12 update