Well, there is a saying, "better late than never". Xiaomi has done too late for their Android One device to send Android Oreo beta build, but the best thing is, it's finally in Mi A1 and you can now download this update as well. To recall, Xiaomi Mi A1 is the Android One series smartphone with guaranteed frequent updates from Google and Xiaomi. Leave about Android Oreo, Mi A1 will also get Android P update guaranteed.
Talking about this update, Xiaomi's Mi A1 got a recent update of their Beta Build of Android Oreo. This means this is not a stable version and probably there might be some errors and bugs as well, and then after removing all those bugs and error, Xiaomi would finally send stable update of Android Oreo. This update is nearly about 1153 MBs and would take a lot of time to update.
In case you missed the specifications and looking to buy Xiaomi Mi A1, here are the key specifications: