DFPlayer has USB pins, D+ and D-, VCC, and GND.
add an USB B socket to those pins, connect it to PC using USB printer cable, and then you can access micro SD card (which is inserted into DFPlayer microSD socket) from your PC
add an USB A socket to those pins, insert U disk to it, and the DFPlayer can access the U disk contents and play MP3 tracks from it.
but beware, i found that DFPlayer which have text "v3.0" on top side, the USB features is not working.
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