Xiaomi has announced the release of the original shell MIUI 7 a little more than 2 months ago. Today started asking MIUI 7.1 stable version for those who bought the products Xiaomi. In fact, the update does not carry a large number of new chips, though they are present. But mostly it's bugfixes and optimizations, which are really a lot, therefore recommended to install.
Xiaomi give out the update for devices Mi 3, Mi 4, Mi Note, Mi 4i, the Redmi Note 4G, Redmi 2 / Prime, Redmi 1S, Redmi Note Prime, Redmi Note 2, Redmi Note 3G, and Mi Pad. For smartphones Mi 2 and Mi 2S has released even a single customized version.
Those who now use the stable version of MIUI 5 or MIUI 6, you can get MIUI OTA 7 to. The rest can easily download MIUI 7 for manual installation here. http://en.miui.com/thread-204184-1-1.html. For this link, you can read the full changelog.