When run system update take many errors from server de.freedif.org.
I have disable ςιτη # from mirror list the line:
Server = https://de.freedif.org/EndeavourOS/repo/$repo/$arch solve the problem.
Must I delete these repo or are temporarily ofline?
It is always a good idea to refresh your mirrorlist occasionally. That should resolve issues like that.
You can do that easily from the welcome app.
Mirror statuses can change from time to time.
To make the EndeavourOS mirrors work again, you can either run
eos-rankmirrors
or manually re-order the mirrors in file /etc/pacman.d/endeavouros-mirrorlist.