Just received Air2 V2.7.1.0 but still no LHDC and Mi Music showns no sound mod (like all BT devices)
Mi9SE 2.11.22
Update: sound quality seems to be improved
Thanks! Yes, indeed I found it in developer options, but it does not work. When I choose LHDC the bluetooth codec stay with AAC.
With my Huawei device it´s shown HWA and the sound seems to be better.
Mi9SE I did not had problems with the update. I'm using Twrp 3.3.1-1018 from LR Team.
Try switch off. Press long time power off.
Start Recovery with I guess volume down power on. Make a clean install.
Check MD5 first.