Dobot magician troubles with 3d printing


Hi. I am using Dobot Magician for 3d printing with Repeiter Host V1.0.6 and last version of Cura 4.7.1. Even if i set Zero point higher than workspace extruder can hit behind zero. What can I change in settings? Or try older versions Cura?
Before using Cura I tried use Slic3r- and it crashes.
Writing and drawing works well.