Download the essential version of Android One ROM to upgrade Mi A1 from Nougat to Oreo. This fastboot ROM with version number 7.12.19 is a stepping stone for every Mi A1 user who wants to have the latest version of Android One built based on Oreo firmware.
The device which initially released running Nougat-based ROM, since December 2017, has received a major update. Its users can now enjoy the latest technology and features available in Android 8.1.
After installing this update, users can then upgrade to the latest version of ROM including the one with version number 7.12.29 Android O.
It means if it happens at some point you have to reset and make a clean install of your phone to run Nougat again, using this version is really recommended rather than going back to any older versions.
Grab the flashable .tgz file from the direct link below.
Read our previous guide on how to flash Android fastboot ROM on Mi A1 (codename Tissot).