Xiaomi has released the Oreo beta update for A1 beta users.
The Update weighs 1104 MB in size
-> Update brings the 1st December 2017 security patch.
-> Overall performance of the devices has being enhanced including the fingerprint scanner.
-> As Xiaomi has promised to release Oreo update for A1 at the end of year 2017, so the Beta process will end soon.
If you are a beta tester then you can update your device.
Go to settings -> About device-> System Updates.