Download and Install AOSP Android 12 on Samsung Galaxy Note 9
Install Android 12 on Galaxy Note 9 (LineageOS 19) - How to Guide! - YouTube
La One UI 4.1 arriva su Galaxy Note 9 ed S9, ovviamente con una custom ROM | AndroidWorld
This is Noble rom, an android 12 custom rom for the Galaxy Note 9 and S9 by AlexisXDA on XDA. It has some bugs but nothing that's deal breaker, some stuff have