We A2 is the second Xiaomi in Android One. The device was released on Android 8.1 Oreo with owners waiting for an upgrade to Android 9 Pie. Pie update seems to be approaching the first beta on the internet. The ROM is complete with all features, but since it's a beta version, there may be software problems and bugs. You can try it after you download it here.
Be cautious as always with flakes – if you have no experience, do not continue because there is a risk of bruising the phone.