A9 Custom Rom: Oppo

Oppo A9 2020 (CPH1937/CPH1938) is a challenging device for custom ROM development due to Oppo's historically restrictive bootloader policies and the device's age. While the hardware remains capable in 2026, official software support ended years ago, making custom ROMs or Generic System Images (GSIs) the primary way to access newer Android versions like Android 14 or 15. 1. Preparation and Prerequisites

Preparation checklist (do these before flashing)

2. Performance Boost (No Bloatware)

Installing a custom ROM on the Oppo A9 (2020) is a high-risk, high-reward process that allows you to bypass the limitations of its now-unsupported ColorOS Oppo A9 Custom Rom

1. Enable Developer options → USB debugging.
2. OEM unlock in Developer options (if present).
3. Boot to fastboot/bootloader (adb reboot bootloader).
4. Unlock bootloader (fastboot oem unlock or vendor-specific command). Wait for wipe.
5. Flash a compatible custom recovery:

   Unlocking the bootloader is the hardest step for Oppo devices. OPPO Care: Forgot your password? Reset it with ease Oppo A9 2020 (CPH1937/CPH1938) is a challenging device

   Final Advice:

   If you want custom ROMs, sell the Oppo A9 and buy a Poco, Xiaomi, or OnePlus device. The Oppo A9 is a locked-down, developer-unfriendly phone that should be left on its stock firmware. Enable Developer options → USB debugging

   Most online "Custom ROM" links for this device are scams or malware. However, here is the reality of what exists and how it performs.