If you want a phone for Custom ROMs, look for devices with unlocked bootloader policies (Google Pixel, Nothing Phone, OnePlus). For your Oppo A9, the best performance boost will simply come from debloating the stock ColorOS via ADB.
To understand if custom ROMs are possible, you first need to know which Oppo A9 you own. There are two distinct variants: Oppo A9 Custom Rom
The Oppo A9 2020 is a robust, budget-friendly smartphone known for its massive battery, decent performance, and 48MP camera setup. However, like many Oppo devices, the stock ColorOS can feel heavy, bloated, and sometimes slow in receiving major Android updates. If you want a phone for Custom ROMs,
The of your Oppo A9 (e.g., A9 2020, A9 2016)? Which Android version you are currently running? There are two distinct variants: The Oppo A9
Flashing a custom ROM carries inherent risks, including the potential to brick your device. Ensure you complete these steps before proceeding:
ColorOS is famously heavy. Custom ROMs like LineageOS or crDroid are incredibly lightweight. By removing Oppo’s background services and advertisements, you reclaim significant RAM and CPU power. Games load faster, and the UI becomes buttery smooth.