This weekend I decided to finally install my Anycubic auto bed leveling update that i bought some months ago. In the way I also updated to the latest Marlin 1.1.9.1 and finally got that first layer working nicely. I mainly followed the great video from https://www.youtube.com/watch?v=5G8GdNywsUQ&t=237s Along the way, I had a weird issue that sometimes the probe would fail and printer would start to go up until it hits the endstops. I later realized that this was caused by the cabling that in some head positions was shorting the cables. Another issue I had, was that the autoleveled seemed to be setting the head way to close to the bottom, making it not able to extrude the first layer. Followed the https://www.youtube.com/watch?v=GF6ZGKOuzhY&t=279s and checked for the real Delta_Height, then added it to the firmware. Added a fork of the marlin software with my configuration here https://github.com/organom/Marlin-1.1.x :)
