The Android TV release 12 update worked for me on my Mi Box 4 but I notice one issue : after activation the options for developpers menu, I cannot open it at all. And then, I cannot des-activate it neither.
Did someone face the same issue ?
Thanks
Yes this is only one of the many problems (number 7 is developer options no longer working) that I encountered with this crappy update on my MiBox and reason why they pulled it now. Many have reported that doing a Factory Reset (this reset will keep you on Android TV version 12) fixes most of these issues below in the new Android TV version 12 that I found happening on my MiBox4 (MiBox S).
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Can’t read SD card (detects the USB thumb drive in System Settings/Storage but cannot read the files in it)
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Kodi no longer opens (blank screen)
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X-Plore file manager no longer opens (blank screen)
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MxPlayer no longer opens (blank screen)
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SMB network (network connection on VLC no longer works, it can read the network but not the files in it)
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both my Avast SecureLine VPN and HMA VPN won’t open (blank screen)
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No longer have access to Developer Option in Settings (you click on it and it exits) although I am setup to have developer options
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My Bluetooth speaker does work on Android 12 but sound crackles/mutes at times every couple of minutes for a 1/2 a second or so and I tested this on a few different aps (I also cleared the cache in the Bluetooth system app and same thing happens)
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When I turn off the MiBox and turn it back on a few hours later, instead of starting up normally, it starts with the MI sign just like when you did a reboot and then you get the Android TV animation screen and then it starts up.
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Remote on Google TV app on cel phone no longer works and you cannot control your MiBox using the Google TV app anymore as mentioned in this video https://www.youtube.com/watch?v=zVY2WMJ2SHI since this update to Android TV version 12
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Google Play Store app crashes at times (black screen won’t open) or crashes when opened at times and I have to reboot for it to work properly again
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Whenever you either use the Google assistant or speak in the Gboard (anything that requires you to use the microphone) there is now a green little icon that appears on top right but when you stop speaking sometimes a little green circular dot will remain on top right of your screen that you cannot remove unless you reboot.
I suggest everyone email their support by using link below:
Maybe try one of those ‘hidden settings’ apps to see if that will open the developers options for you. It’s how I have to get to battery optimisation on a couple of my devices.
Any confirmation that a factory reset will fix the developer options menu? I just updated from Android 9 to 12 and I’m facing this issue… although Kodi, MX player and X-plore works fine for me 
No idea, I have too many things setup so I am not factory resetting it and I decided I can live without the developer options menu for now.
I’m on the same situation hahaha let’s hope someone answers…