The Mi A1, against all apparent odds, received its stable Oreo update on the last day of 2017. The company has pulled the update, though, after feedback from users showed a number of bugs. Probably should have kept this one in beta for a while longer, but hindsight is 20/20.
https://www.notebookcheck.net/The-Mi-A1-s-Android-Oreo-update-has-been-suspended-due-to-concerns-over-performance-issues.278062.0.html