Finally, Xiaomi Mi A1 received official LineageOS support. The LOS development team has released first LineageOS 15.1 nightly build for Mi A1 (code-named tissot). If you are looking for everyone talks custom ROM for your device, then you can download the latest version of LineageOS build right now and install through TWRP recovery.
Xiaomi Mi A1 was launched under the Android One program and the device has got quick software update in the beginning, but things have changed later. For example, the Chinese company recently released Android 8.1 Oreo with June security patches for the device, but pulled out quickly due to various issues.
If you are a big fan of custom ROM, then the good news is that you can now install official LineageOS 15.1 on Mi A1. The build brings Android 8.1 Oreo, stock features, several LineageOS goodies, latest security patch and more to the device.
In fact, it is necessary to unlock the bootloader, install the TWRP, delete the system data and then install the ROM and Google apps package for the correct functioning of the system. Obviously, users should have some familiarity with installing custom ROM.
The status of the LineageOS 15.1 ROM is Nightly, which means it is not stable yet. However, previous experience showed that users could use nightly build as a daily driver without much issue.
The below installation guide will help you flash LineageOS 15.1 on your device. Check out it.
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How to Flash LineageOS 15.1 on Mi A1
1. Download official LineageOS 15.1 from here (link will be live soon)
2. Download Android 8.1 compatible Gapps zip file from here.
3. Save both zip files on your device.
4. Boot your device into TWRP Recovery mode.
5. In TWRP, select Wipe > Advanced wipe > and wipe your data partition fully.
6. Now, select ‘Install’, choose the ROM zip file and swipe to install it. Also, install Gapps zip file in the same way.
After successful installation, reboot your phone. Setup and enjoy new OS. Any question? Leave it in the comment section below. (source)