Custom ROM brings One UI 4.1 to Galaxy S9 and Note 9
Samsung Galaxy S9 Plus (International) ROMs
Samsung Galaxy S9 Plus S9+ G965U AT&T T-Mobile Verizon Sprint 64GB ROM CellPhone | eBay
Samsung Galaxy S9 Plus
Samsung Galaxy S9 Plus 64gb Rom 6gb Ram G965 Gsm Unlocked Smartphone - Manufacturer Refurbished - Coral Blue : Target
Resurrection Remix ROM for Galaxy S9 or S9 Plus! [Android 8.1 Oreo + Root] - YouTube
Samsung Galaxy S9 Plus (International) ROMs
Samsung Galaxy S9 and S9 Plus with Exynos receive a UI 3.1 based on Android 11
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
Galaxy S9 ROM for Galaxy S8/S8 Plus! | HighOnAndroid.com