It took a while, actually a long while. Seems like the first package got lost, but the second arrived in a week (+1 week customs).
I was able to replace the camera and the backplate today in 1-2 hours. It was pain and not fun at all as I'm not used to so small connectors 😄. If you are careful it is possible though.
I broke my power button a bit, which is not so clicky anymore and feels so wrong 😄
It was successful though, the camera works again. So it wasn't a software issue.
The back is also as new now. And I could learn something new today.