FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 23)

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3) Go to the Bluetooth device list of the M11 Plus->Pair new device to complete
the connection.
What can be done if the M11 Plus fails to connect to Bluetooth earphones?
If it fails to connect to Bluetooth earphones for the first time, please make sure
the earphones are in the pairing state (the connection will fail if the earphones
are in reconnecting state for the first-time connection). Go to the Bluetooth
menu of the M11 Plus to start the connection.
What Bluetooth codecs does the M11 Plus support? And how to switch the
Bluetooth codecs?
The M11 Plus supports LDAC, aptX-HD, aptX, AAC and SBC which can be
switched on Settings->Audio->Wireless playback quality menu. 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 M11 Plus is connected
to AirPods?
Go to Settings->About phone, and continuously tap the "Build number" 7 times.
Go back to Settings->System->Developer options menu to turn off the"Disable
absolute volume". Disconnect and reconnect the two devices through Bluetooth.