Yesterday I visited my parents who own a bild 3.40. They have version 4.3.53 installed and they have the same cable provider (Telenet Belgium) and they also use the CI+ module of Telenet. I opened their EPG and it's full of channel logos

How can I re-enable them on my One 55 which also runs 4.3.53 these days?
(I've already done a factory restore, but without succes).
(You may answer in German if you like. I understand German, but unfortunately don't speak it well).
Thanks a lot!
Gert