Projector not working with optik box

[TR7]

I get an "out of display range" warning from my older 720p projector. I have changed the aspect ratio to 720p on the box but I still get the warning. I suspect its due to hdmi 2.2 output from the box. Is there anyway of changing it to hdmi 1.4? Or is there another solution?

[Optik-Kate]

Hi @TR7, might be a long shot, but have you tried using an old HDMI cable? One that is not high-speed or better, but just a HDMI. 

Another suggestion is to try to play around with the projector setting, since that's where you are getting the errors.