I finally used a screwdriver and un- and replugged a few cables:
https://devtube.dev-wiki.de/videos/watch/70e4e4bb-291e-42eb-aca7-804763e839ff
Just discovered this #hackberryPiCm5 #hackberry https://github.com/ZitaoTech/HackberryPiCM5
An ultra portable handheld Linux device using Raspberry CM5 unit as Core with 4" 720X720 TFT Touch display and the original blackberry keyboard - ZitaoTech/HackberryPiCM5
I finally used a screwdriver and un- and replugged a few cables:
https://devtube.dev-wiki.de/videos/watch/70e4e4bb-291e-42eb-aca7-804763e839ff