Sigma releases new firmware updates for several Nikon F-mount lenses that fix issues when using Sigma lenses on the Nikon Z7 camera in combination with the Nikon Z-mount adapter FTZ. This is an improved firmware from what was already announced on October 26th, 2018:
SIGMA Optimization Pro Download page: https://www.sigma-global.com/en/download/lenses/sigma-optimization-pro/
Before updating the firmware using the Sigma USB dock, please ensure to update SIGMA Optimization Pro to Ver. 1.5.0 or later.