Xiaomi started rolling out the Android 11 update for the Mi A3 running stock android as a part of the Android One programme. The 1.4GB update brings enhanced privacy, conversation bubbles, improved notification shade, and several other Android 11 features. No official release date for the Mi A3 update was released even though it is available.The bricking issue seem to be global,there were several reports in the Xiaomi global community forms claiming that the update has bricked the device of some users. The update made the devices to even not detect the charger according to some tweets.
Mi A3 was launched with Android 9 Pie out-of-the-box and received bug filled Android 10 update back in April this year. So we suggest that you wait before you install the latest update.