Let’s be honest. The Oppo A9 2020 was never a developer darling like a Xiaomi Poco or a OnePlus device. There are very few "device-specific" custom ROMs built from source for this phone.
Why?
Based on community reports (XDA Forums & Telegram groups), these GSIs are confirmed to work with varying stability:
| ROM Name | Android Version | What Works? | What Doesn't Work? | | :--- | :--- | :--- | :--- | | LeOS (deGoogled) | 13 / 14 | WiFi, BT, Calls, Battery | Fingerprint (sometimes), FM Radio | | Cherish OS | 13 | Smooth UI, Audio, Camera | VoLTE might break | | Pixel Experience Plus | 13 | Pixel look, Gestures | DT2W (Double Tap to Wake) | | LineageOS 20 GSI | 13 | Lightweight, Stable | SELinux permissive (not enforcing) | | Evolution X | 13 | Customization | Auto-brightness lag |
The "Works" Checklist:
The "Broken" List:
Search: "CPH1937" OR "CPH1939" TWRP or "OPPO A9 2020" MTK client
This blog post explores the current state of custom ROM development for the Oppo A9 2020 (models CPH1937, CPH1939, and CPH1941) as of April 2026.
Breathing New Life into a Legend: Oppo A9 2020 Custom ROM Guide (2026)
The Oppo A9 2020 was a mid-range champion when it launched, packing a massive 5,000mAh battery and a capable Snapdragon 665 chipset. However, with official software support ending at ColorOS 11 (Android 11), many users are looking toward the custom ROM community to keep their devices secure and snappy. The Elephant in the Room: Bootloader Status
Before you download a single file, you need to know the hard truth: Oppo has made official bootloader unlocking nearly impossible for most users. oppo a9 2020 custom rom work
The Challenge: Unlike brands like Google or Xiaomi, Oppo does not provide an official "Unlock Tool" for the A9 2020. Standard commands like fastboot oem unlock usually fail because the fastboot interface is often disabled or locked by the manufacturer.
The Hardware "Trap": Recent reports suggest that some security patches released as late as 2025/2026 may physically blow an anti-rollback fuse. This "double lock" can permanently prevent you from ever unlocking the bootloader or downgrading to an older, more vulnerable version of ColorOS.
Workarounds: Some advanced users have found success using EDL (Emergency Download Mode) tools to bypass these restrictions, but these methods carry a high risk of hard-bricking your phone. Top Custom ROM Picks (If You’re Unlocked)
If you are among the lucky few with an unlocked bootloader, 2026 brings some exciting software options:
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 Let’s be honest
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. The "Broken" List:
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?
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