Can the Great Wall M4 bought on 20 13 play songs on a USB flash drive? I didn't recognize it when I used the flash drive. Thank you! Hello, Great Wall M420 12, there is no 20 13. You can play music through a USB flash drive. The maximum support should be 32G, and the supported format is generally mp3 format. If the download format is correct and the USB flash drive is within the limited size range, you can try a different USB flash drive. If the problem is still like this, check whether there is something wrong with the line. In addition, the SD card can be considered when playing MP3, which is more convenient, and the USB interface will not be accidentally damaged because it protrudes too much. If my answer is helpful to you, please set it as the best answer. Thank you. MP3 file format error. Perhaps the biggest possibility is that the file format on your USB flash drive is wrong. Download the MP3 format directly. 1 Put the songs on the desktop, and change the MP3 format to a USB flash drive instead of a card reader. It is best not to exceed 8G 4. Check the host and cable, it may be in the wrong format. When I downloaded it myself, it was in Mp3 format. You can watch and play by yourself. The Great Wall M4 can play the song @20 19 on the USB flash drive.