Hi and happy 2020.

new year new question, this Christmas I acquired a new OLED 4k smartv and new 2.1 HDMI cable cord for Dreambox One
HDMI 2.1 / UHD HDR 4K 8K 120Hz 2160p 4320p 3D / HDMI 2.0 / eARC Dolby Vision Atmos

Everything works great at 1080p, but if I want to choose from the configuration menu of my dreambox one, the 2160p screen resolution always stays black screen.
The hdmi cable is not the problem with other cables the result is the same.

Does the default Skin support 2160p?
Is there any way for the interface to work at 2160p?

Greetings to all