Installing a custom ROM on the Oppo A9 2020 (CPH1937) is currently difficult, primarily because Oppo has blocked bootloader unlocking for this model. Without an unlocked bootloader, you cannot flash third-party recovery tools like TWRP or install custom operating systems. Current Status for Custom ROMs
Bootloader Restriction: Oppo’s security policies generally prevent official bootloader unlocking on international variants like the CPH1937.
Limited Development: Because the bootloader is locked, there are very few functional custom ROMs available specifically for this device.
Project Treble: The Oppo A9 2020 technically supports Project Treble, which theoretically allows for Generic System Images (GSI). However, a GSI still requires an unlocked bootloader to be flashed. Potential Workarounds
Chinese Variant: Users with the Chinese version of the A9 2020 may be able to use the official Deep Test APK to request a bootloader unlock.
Stock ROM Support: If your phone is experiencing issues, you can download the Official Stock ROM (Flash File) to restore or unbrick it using the MSM Download Tool. oppo a9 2020 custom rom work
Rooting: While standard rooting is blocked, some advanced users have attempted methods using patched boot images through ADB, though this remains risky and complex. Device Quick Info Processor Snapdragon 665 Max OS ColorOS 11.1 (Android 11) Unlock Status Permanently Locked (for most regions)
Are you trying to unbrick your device or looking to upgrade to a newer Android version?
Installing a custom ROM on the OPPO A9 2020 is significantly more difficult than on most other devices because OPPO typically does not provide an official bootloader unlock method for this model
. Without an unlocked bootloader, you cannot flash a custom recovery (like TWRP) or a custom ROM. OPPO India Community Current Status of Custom ROMs Official Support : There is no official custom ROM support
(such as official LineageOS or Pixel Experience) specifically built for the OPPO A9 2020 GSI (Generic System Images) Installing a custom ROM on the Oppo A9
: Since the device supports Project Treble, it is technically possible to run a GSI (like LineageOS GSI or Evolution X) if you manage to unlock the bootloader through unofficial exploits. Developer Community
: Most developers avoid this device because of the locked bootloader, meaning stable, device-specific ROMs are virtually non-existent. Key Technical Challenges Bootloader Lock
: Unlocking the bootloader on this device often requires deep-level exploits or paid third-party tools (like EDL mode flashing), which carry a high risk of hard-bricking the phone. Partition Encryption
: The device uses chip-level encryption for its storage and recovery modes, making it difficult to wipe data or flash new images even if you bypass the bootloader. Feature Loss
: Flashing a custom ROM may result in the loss of proprietary features like Dolby Atmos Game Boost 2.0 , which are deeply integrated into ColorOS. Recommendations & Alternatives Fix 2: Camera Quality
If you are looking to improve performance because the phone feels slow:
Search: "CPH1937" OR "CPH1939" TWRP or "OPPO A9 2020" MTK client
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) .
Given the high risk and low reward, consider these instead:
| Problem | Solution | |---------|----------| | Bootloop after flashing | Wipe data & cache from recovery (stock recovery works). | | No sound in calls | Flash persist.img from stock ROM via fastboot. | | Fingerprint not working | Enroll fingerprint after setting PIN – reboot twice. | | Camera crashes | Install Open Camera or GCam mod (GCam_8.1_arm64 works). | | Battery drain | Disable “Mobile data always active” in Developer Options. |