What Bluetooth codecs does the M21 support? And how to switch the
Bluetooth codecs?
The M21 supports LHDC, LDAC, aptX HD, aptX, AAC and SBC. You can switch the
codec on the menu of Settings->Audio->Bluetooth Audio Encoder. Note that it
needs to be disconnected and reconnected to enable the new codec after
changing it.
What can be done if the volume is too low when the M21 is connected to
AirPods?
1.Go to System Settings-Audio and find the Bluetooth volume adjustment mode.
2.Switch the volume adjustment mode to Sync Bluetooth volume.
3.Disconnect and reconnect the Bluetooth device.
Bluetooth receiving
When the M21 is working as a Bluetooth receiver to connect to a new Bluetooth
device, such as a mobile phone, turn on the Bluetooth, go to the Settings
menu-> Mode choose, and select Bluetooth Receiving Mode. When it is enabled,
the M21 will automatically enter the BT Receiving UI.
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