Xiaomi officially released MIUI9 system on July 26, and the next day it started the development version of the push. On September 8, MIUI completed the development version upgrade of the last batch of models in advance of two weeks, supporting nearly 50 model upgrades including Xiaomi Mi2 and Xiaomi Mi 2S. From the end of last month, MIUI fulfilled its promise that one after another the MIUI9 stable version will be pushed to upgrade its models, but unfortunately the first batch is only the Xiaomi Mi6 and the Xiaomi Mi Max 2.
More than a week has passed that there are three new models to support MIUI9 stable version upgrade, including the Xiaomi Mi Note 3, Xiaomi Mi 5X and THE Xiaomi Redmi 4X. As so far, there are five Xiaomi phones can upgrade "lightning fast" MIUI9 stable system in total.
There are two ways to upgrade MIUI9 stable version: one is to receive official upgrade message push through Official Online Upgrade (OTA) method of Xiaomi or upgrade from "Settings - My Device-MIUI Version" detection and support from MIUI V5, MIUI 6, MIUI 7, MIUI 8 stable version of the direct upgrade to MIUI9 while the Xiaomi Mi7 equipped with this system from the factory.
The other way is to go to the MIUI Forum Manual Brush upgrade, now MIUI Forum download page has been provided Xiaomi 6, Xiaomi Max 2, Mi Note 3, Xiaomi 5X and Redmi 4X five models MIUI9 stable version Brush complete package that the Xiaomi Mi MIX 2 is waiting for a higher version to update.
New MIUI 9 system with the theme of "lightning fast" that on the basic functional experience to conduct a comprehensive optimization, the system flow and stability of a breakthrough. MIUI9 optimized from the bottom of the system, through the use of new file system, CPU intelligent growth, thread scheduling optimization black technology, system-level start-up acceleration that the performance will be excellent like the phone of the Xiaomi Redmi Note 5.