Has anyone figured out how to use an usb cable with a car stereo. I have an older pineeor headunit that had ipod controls and stuff. But not blue tooth. There is no way to mount it with my my phone. If there is I guess idk how to do it. I tried a few times now but fail each time. I have a galaxy s4 btw.
Hey I had the same problem as you (I also have a s4). I found an app called USB Mass Storage Enabler. The only thing is you need to be rooted to use the app and that it o only allows your radio to read the sd card and not the built in memory. If you're ok with that its on the play store.