FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 31)

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Before connecting to a Bluetooth device, you can select the Bluetooth codec you
like in the M11 Plus. Here are the steps.
1) Go to the Settings->Audio menu.
2) Tap Wireless playback quality-> choose the intended Bluetooth codec.
Disconnect the current connection and reconnect the M11 Plus to the Bluetooth
devices.