Some USB devices need to be in a specific mode (such as a Mass Storage Class or Player mode, etc.) before you can use the USB device for playback. Make sure that your device is set to the required mode before connecting it to the car stereo. If the device isn’t recognized, remove the USB device and then re-insert it. The USB device does not have the updated firmware. The USB connection modes, file formats saved to the USB device and file system are not recognized.
Here are the possible causes for the error message to still show up in the display: The USB device is not a supported model. What does it mean when it says USB not supported?
How can I password protect a USB drive without BitLocker?.
