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Developer Releases Android 12 Custom ROM For Galaxy S9 & Note 9
Samsung Galaxy S9/s9+/Note9 Android 12-Based One UI 4.1 Custom ROM [Guide]
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
Samsung Galaxy Android 12 Update Info (2023)
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Android 12 LineageOS 19 for Samsung S9 S9+ Note 9 / S10 & other Devices - YouTube