just an update for my former question: I exchanged the camera-module again and now it is working. It seems, that the other "new" module was broken!
I replaced the back camera, but unfortunately the autofocus of the new camera does not work. All pictures are blurred. When I open the camera-app a "click-noise" can be heard. I also installed 3rd-party app, which has the option to change the focus manually. But that did not work as well. I also did a secure boot, but that also did not solve the problem. Do you have an idea, what I can do?
Thanks in advance,