Just bought a bnew Xiami mi box S with the walmart sale a few days ago.
I already had a mibox S before and it had major issues with Android 9 and HDhomerun prime.
So right now I have a mibox s with version 8 but the one that come in the box is with build 8.1.0 with build number OMP1.171019.011.588 - Security Patches are still from January 2019
When I do system upgrade, it wants to download Android 9 which I'm trying to avoid.
How can I update my mibox s to the latest 8.1.x without upgrading to 9?
Also, how can I remove the Android System upgrade in the notification. I don't want someone accidentally upgrading it.
EDIT: Success! Thanks everyone. I now have the May 2019 Security patches which is definitely better than January 2019. Also, the system seems smoother!
Only Issue I didn't have a USB A to A cable so I used my pixel phone charger (USB-C to USB-A) and it worked :D
I think there are some posts back in Oct that had d/l link for Oreo MiBox S updates. Just be sure you don't try to flash updates for mdz-16-ab. That will get you a brick for certain.
You can block this location with your router to avoid the upgrade notification. When a more stable Pie is available you can undo the router block.
Good luck
https://android.googleapis.com/packages/ota-api/xiaomi_oneday_oneday/