Oppo A9 Custom Rom

Report: Custom ROM Development and Availability for Oppo A9

Device Model: Oppo A9 (Codename: CPH1943 / CPH1941) Report Date: October 26, 2023 Status: Discontinued/Legacy Support

• You are a tinkerer with experience in MTK BROM mode.
• You have a backup device (because the A9 will be unstable).
• You absolutely want Android 14 on a budget phone.

3. Kernel and vendor blobs

• Kernel: Oppo/ColorOS kernel sources should be available per GPL; download official kernel repo matching kernel version (check Oppo open-source portal).
• Vendor blobs: closed-source firmware for modem, GPU, sensors. Extracting blobs:

  Elias looked at the bricked screen. The red exclamation mark was fading as the screen dimmed to save power. He had minutes. Oppo A9 Custom Rom

  | Feature | Status | Review | | :--- | :--- | :--- | | Boot Speed | Slow | Takes 3-4 minutes to boot a GSI. | | Cellular (Calls/4G) | Broken | RIL (Radio Interface Layer) usually fails. No SIM detected. | | Wi-Fi | Partial | Works on some Android 11 GSIs, fails on Android 12+. | | Camera | Broken | Stock camera app crashes. Third-party apps (Open Camera) work at 50% quality. No wide-angle or depth sensor. | | Fingerprint | Dead | No developer has fixed FPC/Goodix sensors on Oppo MediaTek devices. | | Battery Life | Poor | Idle drain of 15-20% per hour due to broken deep sleep. | | Audio/Speaker | Works | The only component that usually works out of the box. | Report: Custom ROM Development and Availability for Oppo

  Custom ROMs for the Oppo A9 are a labor of love, not a guarantee. Proceed with caution, or simply sell the A9 and buy a Xiaomi or Pixel for a proper modding experience. You are a tinkerer with experience in MTK BROM mode

  1. De-bloat via ADB: Without root, remove bloatware:

     adb shell pm uninstall -k --user 0 com.oppo.market
     adb shell pm uninstall -k --user 0 com.coloros.safecenter
     (etc.)
     

  2. Install a Launcher: Use Nova Launcher or Lawnchair to hide ColorOS’s ugly UI.
  3. Use Shizuku + Ice Box: Freeze background system apps without root.
  4. Install a Custom Kernel: There is one known kernel named "Derp Kernel for Oppo A9" (XDA) that improves GPU scaling and battery.

  Android Upgrades: While official support stopped years ago, custom ROMs can bring your device up to Android 13 or even newer versions like Android 15 (SDK 35).

  Installing a custom ROM on an Oppo A9 (2020) is notably difficult because Oppo generally prevents users from unlocking the bootloader on its global devices . Without an unlocked bootloader, standard custom ROMs like cannot be installed through traditional methods. The Core Obstacles Locked Bootloader: Most global variants of the