Nikon updated the firmware for the Z5, Z6 II, Z7 II today. It's just a bug fix to address a problem where the aperture mechanism adjustments of a lens mounted on the FTZ adapter would become more noticeable when you rotated the zoom or focus ring on the lens. The Z50, Z6, and Z7 received a similar update earlier.
Firmware updates are available on Nikon's Download Center Web site.
