I hope your gf device code name is sweet. There are latest versions available as you can find here. https://xmfirmwareupdater.com/miui/sweet/

If you want the latest version of Android with recent security patch, try lineage os or crdroid. But you have to unlock the bootloader and spend little time tinkering on it. You can find a lot of YouTube videos with step by step instructions. I have a device that runs on crdroid with Android 14.

Yes

I started using it for the Android development community. Then for messaging.

Now only for bots 😔

I guess the person is asking for a mute switch. Once the microphone access is granted, the person can’t mute/unmute unless the website provides such an option.

My teeth are really dense. can’t floss.