The IMX8MQUADEVK will not drive an HDMI display. I have tried a 1080p display and also a 4K display. It appears to boot, status LED showing amber/yellow. Backlight turns on and off occasionally on both displays. According to the demo video it should boot to Android GUI with mouse control.
Need help to get this working, or some workaround.
you can refer to the link as below:
How to use dual display on i.MX8 including 4k decoding - i.MXDev Blog