The Linage OS for Redmi 1s is based on the latest Android 7.1.1 Nougat update and it brings tons of other customizations.
This tutorial is supported only with the Xiaomi Redmi 1s devices, codenamed with (armani).
Make sure you’ve rooted Redmi 1s and have a TWRP Recovery installed on your smartphone.
In order to correctly install this Nougat ROM you will need to wipe the data and factory reset your Redmi 1s. This step is included in the tutorial and it means that you will have to backup all your files using cloud storage services, a SD Card or a PC.
More to note:
Try to avoid restoring apps backup using Titanium Backup. It may break things up.
Don’t restore system data using Titanium Backup! It will definitely break the current installation.
It is also discouraged to Restoring Apps + Data using Titanium Backup.
If you done with all prequisites and adfitional notes mentioned above, you can now forward to these steps.
1. Download Lineage OS for Redmi 1s Android 7.1.1 Nougat
Download Lineage OS ROM for Redmi 1s
2. Download Nougat Lineage OS Gapps
Lineage OS rom based on Android 7.1.1 with 64 bit architecture you can download these smallest compatibel GApps package with arm64 sdk 7.1, provided by opengapps.org
Download Gapps Nougat Lineage OS
Choose pico arm (32bit) for the most minimal package.
3. Installing Nougat 7.1.1 Lineage OS on Xiaomi Redmi 1s
Transfer both the Custom ROM and Nougat Lineage OS Gapps packages to the internal storage of your device.
Power off your device and boot into TWRP Recovery mode.
Once, you are into TWRP Recovery main menu, you need to make a hard reset. From the TWRP main menu tap on the wipe button and select Advanced Wipe. Then select all Dalvik cache, System, Data and Cache options.
Flash the custom ROM now. Choose the Install option from the recovery menu and choose the ROM zip from the file manager.
Reboot into revovery after completed, don't reboot into system yet.
Now, flash the Nougat Lineage OS Gapps package that you’ve downloaded before in the same way as you did with the custom ROM
Reboot the device into system and complete the initial setup. Enjoy Android Nougat 7.1 with Lineage 14.1 for Xiaomi Redmi 1s
Now you know where you can download Nougat 7.1.1 Lineage OS for Redmi 1s and install it on your smartphone.
You can also read how to enable native root access in Lineage OS. In those guide also explained to you how to replace native root with SuperSU.
As Redmi 1s have old hardware, CPU and GPU, it may slowing down your phone performance instead of speeding it up. But, it worth to try.