Xiaomi has started rolling out the MIUI 10 beta update to its third batch of smartphones, which were launched a few years back.The devices include the Xiaomi Mi 4, Redmi Note 3, Redmi 3S, Redmi 3X, Redmi Pro, Redmi Note 4, Redmi Note 4X, Redmi 4, and Redmi 4A.Xiaomi has included a lot of new features in the MIUI 10 ROM like support for displays with 18:9, 19:9, and 16:9 aspect ratios, navigational gestures, support for progressive web apps, and much more.MIUI 10 is based on Google's Android 8.1 Oreo operating system.