: At least 60% charge to prevent the phone from powering off mid-process.
(if Google services aren't included) to the internal storage. In TWRP, tap , select the ROM zip, and swipe to flash. (Optional) After the ROM finishes, flash the the same way. Reboot System . The first boot can take up to 10 minutes. Recommended ROMs (Check XDA Forums) : The gold standard for stability and clean Android. Resurrection Remix : Best for high customization. GSI (Generic System Images) samsung a9 pro custom rom
: Experience newer Android features (like privacy controls and improved notifications) that were never officially released for this model. : At least 60% charge to prevent the
Avoid "one-click ROM installers" or paid ROM websites. They are scams or malware. All legitimate custom ROMs are free. (Optional) After the ROM finishes, flash the the same way
on your PC. It should show a blue/light blue bar in the "ID:COM" section if the device is connected. button and select your TWRP tab in Odin and uncheck "Auto Reboot" . Once it says "PASS!", unplug your phone. Force a reboot by holding Volume Down + Power . The moment the screen goes black, immediately hold Volume Up + Home + Power to boot straight into TWRP. 4. Wipe and Flash Custom ROM In TWRP, go to Format Data
If you proceed, join the XDA thread for your chosen ROM to get the latest bug fixes and build dates. Good luck!
The process is not for beginners. If you miss a step (like flashing the wrong vendor image or wiping the EFS), you can hard brick your device. Read the XDA forum threads for your specific model number (SM-A910F vs SM-A9100) as they have different modem partitions.