[ROM] CyanogenMod 12.1, ROM for the Xiaomi Redmi 1S
CyanogenMod is a free, community built, aftermarket firmware distribution of Android 5.1 (Lollipop), which is designed to increase performance and reliability over stock Android for your device.
Reboot into recovery (latest official TWRP recommended).
Wipe Data, System and Cache if it’s a fresh install.
Wipe Cache and Dalvik Cache if you’re updating from a previous version of CM 12.1.
Flash ROM and Gapps.