To change others to av settings
1. Turn off bluetooth of both iphone and headunit
2. Remove hdmi and usb cable from headunit
3. Press reset button on the lower left side of headunit, turn the unit off
4. Try to change to digital settings, if it doesnt work please continue the steps
5. Put back the usb cable to port 1 ( the one below) reset the headunit again, turn off headunit and bluetooth and try to change to digital settings
6. If both doesnt work, remove the usb in port 1, connect the hdmi, reset the unit, turn bluetooth and headunit off, change the settings.
Let me know if not