How To: Upgrade the Firmware on a Nikon Z6 or Z7 - YouTube
Nikon brings Face/Eye AF improvements to the Z5, Z6, Z7 and Z50 with firmware update
Amazon.com: Nikon Z7 / Z6 Experience - The Still Photography Guide to Operation and Image Creation with the Nikon Z7 and Nikon Z6: Updated for Firmware 3.31 eBook : Klostermann, Douglas, Klostermann, Douglas: Books
Z6 Firmware update: Nikon Z Mirrorless Talk Forum: Digital Photography Review
Finally Competitive, Nikon Z6 II Firmware Gives Me Hope for the Series
Will the Nikon Z6 get any new firmware updates? - Quora
Nikon Z6 II firmware update fix for EOSHD Z-LOG and custom picture profiles in 4K/60p - EOSHD.com - Filmmaking Gear and Camera Reviews