I've posted unit information and an update to my github https://github.com/superdavex/Sony-XAV-AX100 that can disable the caution screen message. I'm just getting started documenting the unit, but, the basic info is there. I've tested this update on a couple of units, but, there is always a danger in installing a firmware that something could go wrong. I have also been able to enable the UART serial console and the first USB port (USB 0). These require soldering on a connector. The system is pretty much wide open and we have full kernel source so there is not much that we can't change on it. The change that that is disabling the caution screen warning is just sending a dbus touch event. It works fine, but, there are possibly better ways to do that. Use at your own risk.A video of the unit starting without the caution screen.