According to a report published by Gadgets 360, the official Xiaomi post informs Mi A1 smartphone owners to install the software version 7.12.19 (Android Nougat) on their devices at first. It is only after this that the Android Oreo (version 7.12.29) will be made available and compatible with them.
Read more: Xiaomi rolls out Android 8.0 Oreo to Mi A1
Buy this from Amazon