Once inside TWRP, you’ll have a touch-based menu allowing you to create full system backups (Nandroid backups), wipe partitions, and install ZIP files—including custom ROMs.
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
Go to Settings > About Phone > Tap "Build Number" 7 times. Go back to Developer Options and enable "USB Debugging" and "OEM Unlocking." Step-by-Step Installation Guide Oppo A9 Custom Rom
But a word of caution before we dive in: The process is risky, voids your warranty, and can brick your phone if done incorrectly.
He missed. The port was loose. He had to wiggle it. Once inside TWRP, you’ll have a touch-based menu
Privacy-focused users and lovers of classic Android utility.
Unlocking the Full Potential of Your Oppo A9: A Comprehensive Guide to Custom ROMs He missed
Evolution X brings a Pixel-like design but embeds a massive "Evolver" customization menu into the settings. You can tweak everything from power menu styles to lock screen clocks, making it perfect if you like to personalize every corner of your user interface. 4. ArrowOS
For MediaTek variants, there is also a thriving underground community of developers creating tools to force unlock the bootloader using specialized software like . One comprehensive resource is the GitHub repository “OPPO MediaTek Notes,” which offers complete step-by-step guides for bootloader unlocking, fastboot unlocking, custom ROM flashing, and rooting.
Back up photos, contacts, and personal data to a cloud or PC. Charge Battery: Ensure your battery is at least 60% full.