Samsung One UI 3.1 Update Brings Select Powerful Features From the Galaxy S21 to the Galaxy S20, Galaxy Note20 and Galaxy Z Series – Samsung Global Newsroom
Noble ROM 3.1 brings One UI 5.1 for Galaxy S9, S9+ and Note 9 - SamNews 24
Install One UI 3.1 Android 11 Rom on Galaxy S9+/Note9/S9 - NobleRom V1.1 - YouTube
Noble ROM brings One UI 5.1's image Clipper feature for older Galaxy devices [Download]
Exynos Galaxy S9 users can now enjoy Android 11 with One UI 3.1 via Noble ROM
Samsung One UI 3.1.1: Eligible Devices, Features and Release Date - Sammy Fans