Geeetech

Hello,
unfortunately I have a small problem with my A20T, I bought and connected a 3D Touch, then I downloaded the appropriate firmware and loaded it onto the board. The 3D Touch is also recognized, but I can't create a Z offset because I can't determine a minus value for the Z axis.
I can't set a Move Z: -000.2 etc. in the menu.
It stops at +000.0.
What do I have to do so that I can determine the T offset?

Thank you very much

Kind regards
Olaf Reis

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