Which HD did you use ? <| sep |> Just got that L email so if you haven ' t gotten it yet keep your hopes up ! <| sep |> tbh that ' s the primary reason we beat them last time , he over threw a ton of wideopen targets <| sep |> When using USB , the car radio has to read the audio files directly . There , it is responsible for picking the album art out from the files . If the album art is embedded in the mp 3 file itself , this usually works okay , but there are many other ways album art gets stored on phones , including being stored in a hidden file separate from the mp 3 s or being looked up from a server as needed . Generally , car radios are not programmed to handle these other cases because they would require outside information to work . When connected via Bluetooth , the phone sends a stream of audio data , plus some commands to set the album art and text . In this case , the phone can pass along the hidden file or lookedup image directly from the player app .