Ensure the printer is turned off and not plugged in.
While moving with the extruder, the X-axis motor works as a generator. You will create a small amount of electricity and the LCD might flicker. Move with the extruder reasonably slowly and in the future always use the printer's controls.
⬢Move the extruder manually all the way to the left.
⬢By rotating BOTH threaded rods at the same time on the Z-axis move the nozzle until you reach the heatbed. Try rotating both the rods equally!
Check again from a different angle the nozzle is touching slightly the heatbed. Don't bend the heatbed!
Don't place the steel sheet on the heatbed during the entire P.I.N.D.A. probe adjustment process. Wait for the XYZ calibration.
I also used the paper method to be sure not to scratch the heatbed and it worked pretty well for me. I would alsways recommend using paper between Nozzle and heatbed and go down just until the paper is catched and do this once left, then right and then a crosscheck in the center.
If I move the extruder all the way to the left and go then down it happened to me, that the cable bundle hits the electronic box and can not go further down. As electronic box is in its predefined position as well as the cables coming from the extruder (by design) moving “all the way to the left in the uppermost Z-posiontion will be about 2mm too far left. This should be mentiones somewhere.
The second photo has arrows pointing at the horizontal bars of the X-Axis,, yet the related instructions are about ROTATING the vertical threaded rods. Shouldn’t the picture include those threaded rods and the arrows be pointing at THEM?
“''Ensure the printer is turned off and not plugged in.'' “
Well, since we haven’t yet been instructed to plug the extension cord into the PSU or into a wall socket it would be pretty strange for it to be plugged in and turned on.