Hey there, I am having an issue where my z-axis will not home, or go down any lower than what the height is upon start up. I had previously been running your 4.0.0 firmware, with a BLTouch 3. Everything was working fine, I just wanted to update the firmware to the newest version. Now my z axis wont home at all. I have checked the wires multiple times, even swapped some out. The bltouch turns on, I can run the “self test” on it just fine. When I try to home the axis’, x and y home fine, then the nozzle moves to the middle of the bed (normal), then deploys and immediately retracts the probe from the bltouch. I cant even drop the z axis on my own in the controls. It thinks it is at 0 and will not let me move it any loewr.
This is because you have a wiring problem or a fault on your board.