Xiaomi Redmi 1S Gets Android 6.0.1 Marshmallow Support via TWRP 3.0: Update Guide
Xiaomi Redmi 1S phones gets upgrade support for Android 6.0.1 Marshmallow via TWRP 3.0 custom recovery. The ROM brings a laundry list of features and enhancements that come with the custom upgrade. Install here.