From Sigma:
For customers who own the SIGMA USB DOCK and applicable product listed below, please update the firmware via SIGMA Optimization Pro.
Sigma 100-400mm F5-6.3 DG OS HSM | Contemporary for Nikon F mount
Benefit of the update (v.1.03)
B&H carries the Sigma 100-400mm F5-6.3 DG OS HSM | Contemporary Lens.