Thank you very much. This worked!

Hello everyone, Excuse me for talking in English but my German is too bad and I don't find any other Loewe communities. So I have a Loewe bild 1.55 (2017) which supposedly supports 4K (UHD). Only HDMI port 4 supports UHD. So now I linked my Playstation 5 with a HDMI 2.1 cable into this HDMI UHD port...