Z 9 Firmware Version 5.20

https://downloadcenter.nikonimglib.com/en/download/fw/553.html

Make sure you read the warnings in red!

Changes from "C" Firmware Version 5.10 to 5.20:

• • Added support for "NX Field^*", a remote shooting system for corporate users.
  * Visit the “NPS” website for overview and user’s manual of NX Field.
  Nikon Professional Services (NPS) (English)
  Note: "NX Field" app for smart devices may not be available in some countries and regions.
• • Renamed d14 [Display on during burst] in [CUSTOM SETTINGS MENU].
• • Fixed the following issues:
  • - Pressing the playback button after repeatedly shooting bursts would in rare cases corrupt the display of all images.
  • - In rare circumstances, optimal exposure could not be achieved during burst shooting after changing the exposure in mode M.
  • - In synchronized release, pressing the shutter-release button of the master camera halfway initiated autofocus on the remote camera with the following setting selected.
    • ▸ [CUSTOM SETTINGS MENU] > a6 [AF activation] > [AF-ON only]