- Official firmware did not work at all.
- Format the sd card and install https://github.com/smith3d/Marlin/releases/tag/2.0.x.14 - https://github.com/smith3d/Marlin/releases/download/2.0.x.14/Smith3D-E3V2-2.0.x.14-5x5-SlowProbe.bin
- in Cura machine settings G29 ; worked
M420 S1 Z2
failed andM420 S1
worked in cura machine settings- Adjusted the z axis offset to -2.70 mm after doing the manual bed leveling. Z offset tuned using Z-offset Tool
- try 5x5 fast firmware from smith3d