LineageOS 15.1 official also for Xiaomi Redmi 3S and Redmi 4X
As a reminder, we remind you that the LineageOS ROM is based on the operating system Android (AOSP), which arises from the ashes of the best known Cyanogenmod. Its aims are to resume the development from where the CyanogenMod project had stopped but at the same time to break away from its past with Cyanogen Inc. Nightly they are compiled and built automatically every week always based onlatest version of Android and including the latest security patches every month. (source Wikipedia)
But apart from the historical preamble, if you want to try the nova LineageOS 15.1 and then Android Oreo on your Redmi 3S / 3X and Redmi 4X, we remind you that the installation provides, as for the other ROM, the unlocking the Bootloader and the presence of a rmodified modified ecovery, for example, the TWRP. So you just have to stay download by clicking on the buttons below based on your smartphone.