Xiaomi Mi3 is a high-end Android smartphone, released by Xiaomi Tech in November 2013. The Mi3 features a 5″ IPS LCD display with 1080 x 1920 resolution. It’s powered by either a 2.3GHz quad-core Snapdragon 800 processor, or 1.8GHz quad-core Nvidia Tegra 4, depending on region. Both feature 2GB of RAM. Internal storage comes in at either 16GB or 64GB internal storage. The Mi 3 has a 13MP shooter with full 1080p video recording, and a 2MP front facing camera. The device is fed by a non-removable 3050mAh battery.
Xiaomi Mi 3 does not have the latest Android 5.1.1 OS. It can be updated to Android 5.1.1 using CM 12.1 custom ROM. Also using this ROM, you will loose the MIUI but the device will perform better. Follow the guide below to install CM 12.1 ROM for Xiaomi Mi 3.