Download latest Mi Box S Android 9 Pie OTA 2 Beta 3 OTA update.
This is the full firmware (or full OTA update). So regardless if your device is on Android 9 Pie beta program or the stable Android 8.1 Oreo channel, you can still manually install the new OTA zip via recovery method listed below.
You can either go to settings > About Page > and check for OTA updates manually; if you have already enrolled into the beta program. Alternately, download the OTA zip and update manually.
Note: As the update is new, it may take some time to capture the OTA zip file.
Download Mi Box S Android 9 Pie
Previous Mi Box S Android 9 Pie | OTA2 beta 2 update (post link)
The OTA update download link will be available soon directly from Android’s repository. This will be the full OTA update zip consisting of stable Android 9 Pie which can easily be sideloaded onto Mi Box S via stock recovery from beta channel or stable channel.
How to update Mi Box S to Android 9 Pie OTA manually?
As the update is official stable version, you will most likely receive the OTA update notification. Simply go to settings > about device > system updates. Alternatively, you can manually update your Mi Box S to Android 9 Pie once the OTA download link is available (above); which won’t be long.
You will need to reboot Mi Box into recovery mode and choose the option to apply updates from storage or SD card. Select the file and install. This is standard update protocol for most of the Android devices.