3. How to switch the four working modes of the M15?
The M15 has four independent working modes: Android mode, Pure Music mode，USB DAC mode (Based on XMOS, supporting up to 768kHz-32bit/DSD512; And it requires installing the FiiO USB DAC driver before use), Bluetooth receiving mode (based on CSR8675, supporting SBC/AAC/aptX/aptX_LL/aptX-HD/LDAC).
If the player is in Android / Pure Music mode, you can tap the 'Mode Selection' in the pull-down shortcuts menu to select a different mode.
Or if in USB DAC/ Bluetooth receiving mode, you can tap the settings icon on the upper right to switch to another mode.