@number40fan:

Get the nozzle to grip a piece of paper.

Run G92 Z0
G1 Z5
G30 S-1
G1 Z5
G30 S-1
G1 Z5
G30 S-1

After running the above a few times, make sure you get consistent numbers on the reply from running G30 S-1.

https://preview.ibb.co/geASRv/TgttPSy.png

That will be your number you put in here.

https://preview.ibb.co/dE3aDa/Y3uSKMV.png

Thanks for help. It working good now.
I'll make chinese version document all i can do.