9. What Bluetooth codecs does the M11 support? And how to switch the codec?

A: The M11 supports the HWA, LDAC, aptX-HD, aptX and SBC codec. The HWA codec needs to be switched in the FiiO Music settings, while the others can be switched in system Settings -> Audio ->Wireless playback quality. Also, kindly note that after switching the codec, you'll need to disconnect the Bluetooth and then reconnect to have the changes take effect.