Using Xiaomi.EU Beta 9.8.9 on Redmi Note 7, I realized that my audio is extremely low when using a headset, even with apps like Viper or Dolby. The solution is to change a line using a build editor (you need to root), look for the ro.miui.region line and change it to BR and you will get your...
I am also having problems with the sensor. I can solve using calibration apps but it won't work again when I restart the phone. Applications like Cpu Z or Aida64 do not recognize that the device has a proximity sensor. I use Redmi Note 7 too!
Sorry my bad english