4K output to projector

[Mister_swede]

I have 605 box and choose channel with 4K
The projector info says 1080P

If I try to set hdmi in box setting to 2160 it just flicker and return to default
Any suggestions?

HDMI cable and projector is 4K

[Mister_swede]

Sorry my bad solved it

The hdmi went to a sound device and no 4K
Took the projector directly to box and perfect 4K

So now I need to solve where to take sound