First I had a problem with autohome because the cable of the Z endstop didn t work.
Got this fixed now. Autohome works, but the correction of the height of the platform does not.
Finally I cannot fasten the screw at all, it has reached its limit and the distance between the head and the platform has got bigger, not smaller. About 5 mm.
I tried to loosen the screw a few times with little effect too.
I could get the platform higher with the screws under it, but that is not the way tot do it, I guess.