Bambu Lab A1 mini - Bed leveling error

i am having an issue with bed leveling.

i did a full calibration, but I keep getting: bed leveling failed

any solutions for this?

Do you have a plate installed when calibrating?

yes! a original BL Textured PEI plate

Have you made sure the plate is fully seated (flat) everywhere on the bed?

Homing and leveling failure troubleshooting guide for A1 series | Bambu Lab Wiki

Yes, I even cleaned the plate and bed several times…