In the end i used heat.
I wanted to know which chip cracks. So i first heated the gsm chip, which worked well, didnt destroy anything but didnt fixed the issue.
While heating gazoo i applied too much heat and air pressure blew away some parts. And some of them are really tiny.. At this point telephony function was gone for sure. From here on fun began, no half things.

At the start: i dont know some say it is related to pressure and bending. Some say it might be humidity and corrosion.
But gazoo seems to be a common error on other nokia phones too.

I seldom touch my phones with velvet gloves, too, but as i already said: no parcour here