I did download the DC app package 4.4.0 from the Collaboration Rooms and with these files I then updated all the apps on my CORE X3, which worked. Now I have core22 and core24 installed and I only can uninstall core24. I would expect it to be vise versa...
The CORE X3 came with major version 1.20 (core20), I then did update all apps to 2.6 and then afterwards 3.6 and finally to 4.4. I also did press the "Upgrade des ctrlX OS" button before and it also worked. I think then it changed the core so that the old one could be uninstalled, but this time it does not work any more and I get the following error message: "Mehrere Fehler sind aufgetreten
Remodeling executing: Remodelling execution failed - error: Operation failed (Code: 400)! Message:
cannot remodel device: cannot remodel from grade dangerous to grade signed".
Could it be, that the core20 is not fully uninstalled, because it is still listed in the factory reset menue?: