Nikon has released an essential firmware update for the flagship Nikon Z9 that corrects a critical issue. Nikon Z9 firmware v5.31 downloadYou can download the latest update from the Nikon website, along with the update manual:Windows downloadMac OS downloadSupplementary firmware update manualMy advice is to hold off downloading v5.31 for a few weeks. AF-F is the other main Z9 focus mode and is only available for video. The latest firmware update brings small but important changes to the Z9’s autofocus and will be particularly welcomed by vloggers and fast-action shooters. You may also like…Take a look at the best lenses for the Nikon Z9 and see how Nikon's flagship compares to the best professional cameras from the other big brands.