hi，@PoE 1. Please update the firmware again, and then execute the Z-axis compensation execution code; BLtouch Z axis compensation code.zip Ender-5Plus -BLTouch -0117_V1.70.2 BL.hex https://drive.google.com/drive/folders/14TmzhP_OleP9I098mP3SVDwxpa_gqwSU Level again according to the unboxing video and leveling video. https://youtu.be/soSrvoosY1c https://youtu.be/NBatdrVr-mM If the issue still exists, please send an email to cs@creality.com and attach the videos in detail. There will be professionals to help you.

Did you add a SDL file directly? If that is the case, it's absolutely normal: you first have to use a slicer to make a GCODE file from the STL. An STL represents the geometry of the object, while the GCODE contains the instructions for moving the print head in order to create an object. A printer needs a GCODE.