No sound when inserting a USB drive or SD card

Solution:

1. Check if the music is saved to the root directory.

2. The compatibility of the USB drive or SD card is not good. You need to format the USB drive or SD card and then copy the music, or change the USB drive or SD card to play.

3. Check if the music files are in MP3 format, as some different music files cannot be parsed by the amplifier decoding board.