Punch the screen as hard as possible, should dim it plenty. Honestly I would just try calling a local dealer ship to see if there is an update or not.
My pioneer had a "sleep" button where the screen would go black, then just tap the screen for it to light up.
Just have some light window tint cut to fit over it. I don't understand why ya'll have so many issues with lights being too bright. You must like the stock halogen headlights too because they're dim?
It has a night time mode, and auto-dim, but it's still bright as hell.