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If you are holding an Oppo A9 2020 (codename: CPH1943), you probably remember it as a budget champion. With its massive 5000mAh battery, the Snapdragon 665 chipset, and a surprisingly decent quad-camera setup, it was a workhorse. But in 2024, ColorOS might be feeling a bit sluggish, or perhaps you're stuck on an older Android version and craving the fresh look of Android 12, 13, or even 14.
This brings us to the big question: What is the current state of custom ROM work for the Oppo A9 2020?
Let’s dive into the development scene, the challenges, and the best ROMs available right now. oppo a9 2020 custom rom work
Developing a custom ROM for the Oppo A9 2020 is a high-difficulty task. It is not a "copy-paste" project like developing for a Google Pixel. It requires navigating a restrictive partition layout, dealing with Oppo’s proprietary encryption and "Oplus" common trees, and compensating for the lack of open-source camera drivers.
However, with the correct vendor blobs extracted from the latest firmware and a modified device tree capable of handling the oppo_reserve structure, stable Android 11, 12, and 13 ROMs are technically feasible.
Recommendation: For anyone undertaking this project, starting with a device tree from a similar chipset (e.g., Xiaomi Mi A3 or Redmi Note 8) and adapting it for the Oppo partition layout is the most efficient path to a bootable build. Unlocking Potential: The State of Custom ROMs for
So, does custom ROM work? Yes, partially. But not in the traditional "download a ZIP and flash it via TWRP" way. Instead, the Oppo A9 2020 relies on Project Treble and GSIs (Generic System Images) .
Who doesn't want that Pixel look? Pixel Experience brings the Google Pixel launcher, wallpapers, icons, and camera features to the A9 2020.
The Oppo A9 2020 can run custom ROMs, but the experience is not polished. You trade security updates and customizability for broken hardware features (fingerprint). The GSI ecosystem is alive, but the MediaTek platform holds it back. The Verdict on "Work" So, does custom ROM work
The Best Setup Right Now (October 2025):
While the development scene for this device isn't as massive as the Redmi Note series, dedicated developers have kept this phone alive. Here are the top picks currently making waves:
From community reports, the only ROMs ever built for this device are:
Once the custom ROM boots, you aren't done. Here is how to fix the remaining issues: