Mi A2 is the second Xiaomi of Android One. The device has been released with Android 8.1 Oreo, and owners are awaiting the upgrade to Android 9 Pie. Pie update seems to be approaching the first beta version leaked from the internet. ROM contains all features, but it is in beta, so there may be problems and software bugs. You can try it after downloading from here.
Always be careful of debris. If you do not have experience, do not proceed because there is a risk of your phone becoming bruised.