As MI had promised that by the end of this year they will release the Android O updates and till 30th users had didn't received. But today morning users started getting Oreo updates which is approx of a Gigabyte size.
At beta release, users have noted that Oreo updates features with fast charging capabilities. Moreover we have seen lots of UI improvement.
After getting stable Oreo updates phone is more responsive, and it's fingerprint too. I personally using MI A1 and feel lots of improvements.
If you haven't got update till yet you can follow these instructions-
Settings > apps > show system> select google framework service> clear storage>
Restart the phone.