Connect your phone to your PC while still in TWRP. Your phone will appear as a storage drive. Copy the custom ROM .zip file (and the corresponding Google Apps/GApps package if your ROM doesn't include it) to the phone's internal storage or SD card. Tap in the TWRP main menu. Browse and select your custom ROM .zip file.
Charge the phone battery to at least 70% to prevent unexpected shutdowns. Use a high-quality, reliable USB data cable.
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For a clean, lightweight, pixel-like stock Android experience.
Immediately switch to holding to boot directly into TWRP Recovery Mode . Once in TWRP, swipe to allow modifications if prompted. Select Wipe > Advanced Wipe . samsung a9 pro custom rom
Download the latest Odin3 tool and Samsung USB Drivers to your computer. Step 1: Unlock the Bootloader
The instant the screen goes black, quickly switch to holding to boot directly into TWRP recovery.
Download and install the official Samsung USB Drivers on your Windows PC.
Note: The first boot after flashing a new ROM can take anywhere from 5 to 15 minutes. Be patient and do not interrupt the process. Troubleshooting Common Issues Connect your phone to your PC while still in TWRP
Copy the file and the GApps .zip file onto your phone's internal storage or external SD card. Disconnect the phone from the PC. In TWRP, tap Install .
Click on the button in Odin and select your downloaded TWRP .tar file.
If you want your A9 Pro to look and feel like a Google Pixel, Pixel Experience is the best choice. It includes all Pixel features out-of-the-box. 3. GSIs (Project Treble)
The most popular choice for long-term support. While official builds have largely ceased for this specific model, unofficial versions (often based on Android 8.0 LineageOS 15.1 ) are frequently used to replace the stock experience. Stock Oreo (SM-A9100): For the Chinese variant, users often flash the official Android 8.0 Oreo firmware via Tap in the TWRP main menu
Download and install the official Samsung USB Drivers on your Windows PC. This ensures your computer recognizes the device when booted into specialized maintenance modes. 2. Enable Developer Options and OEM Unlocking Open on your phone. Navigate to About Phone > Software Information .
To help narrow down the next steps for your device upgrade, let me know:
Unlocking the bootloader permanently trips Knox , which voids your warranty and permanently disables services like Samsung Pay and Samsung Pass.
The Samsung Galaxy A9 Pro remains a legendary mid-range device, celebrated for its massive screen and robust battery life. However, official software support ended years ago, leaving the phone stuck on outdated Android versions.