"USB device not support" message is displayed on the car audio while playing via HDMI.
IMPORTANT: This article applies only to specific products and/or operating systems. Check the Applicable Products and Categories section of this article before starting these steps.
This issue can occur when you connect a USB cable for a power supply of an HDMI source device to the USB port of the unit.
To avoid this issue, connect the HDMI source device to a different power supply, or change the USB cable to another cable which only passes through the power supply.