The Oppo A9 is compatible with Project Treble and Generic System Images (GSIs) . Since it shipped with Android 9, it supports Treble. This means you can flash a "generic" ROM designed to run on any Treble-compatible device.
Installing a custom ROM on an older device like the Oppo A9 (2020) Go to product viewer dialog for this item. Oppo A9 Custom Rom
(like LineageOS or Pixel Experience) that is compatible with your exact Oppo A9 model number? The Oppo A9 is compatible with Project Treble
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