New Update on April 17, 2020: Today Xiaomi started rolling the new Android 9.0 Pie beta update to the public with build 2604 which brings a lot of changes and bug fixes. You can follow the guide, at the end of this post, on how to manually install the update on your Mi Box S.
The update weighs almost 654MB in size and brings build number r2604 with many new fixes and improvements.
– Upgrade your Android system to 9.0
– Fixes Chromecast not working issue
– Fixes issue with playback freezing in some apps
– Fixes special H264 decode error
– Fixes issue with Bluetooth audio not syncing with video
– Fixes HDMI compatibility issue
– Fixes pop sound when STB is in standby mode
– Fixes issue with Gboard not working when connecting an external keyboard.
Updated on April 10, 2020: We are all aware that the Chines technology giant Xiaomi, is not only a smartphone manufacturer but has its hands dig deep in various other categories like tv, home appliances, IoT, etc. you name it. The company even manufacturer electronic umbrellas for that matter. Xiaomi is also known for manufacturing Android TV boxes. For those who do not know, Android TV boxes are special devices that can turn your ordinary TV into an Android smart TV. Just the requirement is that your TV needs to have an HDMI port and you are good to go. Among various Android TV boxes, Xiaomi has made the Android 9 Pie beta 2 update available for its popular Mi Box S.
The new update is arriving with the build R2596 and has been pushed via OTA. The Mi Box S is powered by Android and gives the users the support of Google Assistant, Chromecast among others. Point to note is that, the Mi Box S has already gone through a 3-beta update procedure before the stable Android 9 Pie update arrived for the device. However, it left several users unhappy has it made the Android TV box unusable. But, it seems like Xiaomi is rolling out a more stable version of the Android 9 Pie for the Mi Box S.

Having an issue with the last firmware updated automatically I tried to reinstall an older firmware. Unfortunately I get the error “E3003: Can’t install this package (…) over newer build (…). Installation aborted.”
Do you know how I can do the update (downgrade)?