Xiaomi MI 2/2S is a phone released in 2012 and 2013, Lei Jun once leaked there are still 5 million users to use Xiaomi MI2/2S, and after that, its official said this two models will be upgraded to MIUI 9 OS, but the time will be late, according to Xiaomi plan, the first batch to upgrade to MIUI 9 is Xiaomi MI6 and Xiaomi Redmi Note 4X Snapdragon version, the second batch is some hot models, including Xiaomi MI2 and Xiaomi MI2S.
Right now Xiaomi MI2S has got MIUI 9 stable version update, centering on basic function to optimize, in system running and stability, it has made breakthrough. MIUI 9 OS has made deep optimization by new file system, CPU smart acceleration, linear adjustment, etc to achieve system acceleration launching.
As Xiaomi bestseller series, Xiaomi MI2/2S can not compete with those high-end processor smartphones, but from MIUI V4 to MIUI 9 OS, it can be regarded as the longest life span series models.
There are two ways to upgrade to MIUI 9 Stable version, one is by OTA, receiving official updating news push, or choose from ‘Settings’-> ‘My Device’->’MIUI version’ to detect to upgrade, supporting from MIUI V5, MIUI 6, MIUI 7, MIUI 8 stable version to MIUI 9. The other way is to go to MIUI forums to download the ROM to upgrade.
Now MIUI forum can offer Xiaomi MI6, Xiaomi MI MAX 2, MI Note 3, MI 5X, Redmi 4X, Redmi Note 5A, Xiaomi MI5, Xiaomi MI5C, Xiaomi MI Note 2, MI 5S, MI MIX, MI5S Plus, Redmi 5A and Redmi Note 4X Snapdragon version, Xiaomi MI MIX 2, MI Note top version, MI 4S, MI 4C, 18 models in total can upgrade to MIUI 8 Stable version.
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