One UI 2.1 brings relatively few changes
Certain One UI 2.1 features that work hand-in-hand with the newer hardware, such as the option to switch to 120Hz mode, won’t be available on older Galaxy devices even after the update. Obviously, there are technical limitations that prevent some features to be ported over to older models. But other UI changes like the additional Screen Zoom options and/or Samsung Quick Share should be made available on older phones via the One UI 2.1 update
