Nikon releases the upgraded firmware for its full-frame mirrorless cameras — Version 2.00 for the Nikon Z 9, and Version 1.40 for the Nikon Z 7II and Nikon Z 6II | News | Nikon About Us
New Nikon Z7II, Z6II, Z7, Z6, Z5, and Z50 firmware updates released and available for download - Nikon Rumors
Nikon Z50 gets eye-detect AF for video in latest firmware update | Digital Camera World
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
Nikon Z50 V2.00 and Z7/Z 6 V3.10 Firmware Updates | Photography Blog
How to Find & Update a Nikon Z7's Firmware Version
Nikon announces update for Z6 II and Z7 II, adds 4K/60p to Z6 II and Blackmagic RAW to Z6 II/Z7 II