Nikon just released firmware version 1.5 for the Nikon Z5. The following are details from their website.
Added support for the power zoom feature on power zoom lenses.
[русский (RU)] has been added to the languages available via the [Language] item in the [SETUP MENU] for Z 5 cameras sold in the Middle East.
Fixed the following issues:
When an SB-500 flash unit was mounted, changing from spot metering to another metering mode did not change the i-TTL flash control from standard i-TTL fill-flash to i-TTL balanced fill-flash.
Viewing other pictures in playback zoom display would fail after zooming out a “tall” picture with a pinch gesture.
Added support for the power zoom feature on power zoom lenses.
[русский (RU)] has been added to the languages available via the [Language] item in the [SETUP MENU] for Z 5 cameras sold in the Middle East.
Fixed the following issues:
When an SB-500 flash unit was mounted, changing from spot metering to another metering mode did not change the i-TTL flash control from standard i-TTL fill-flash to i-TTL balanced fill-flash.
Viewing other pictures in playback zoom display would fail after zooming out a “tall” picture with a pinch gesture.
Download from here
https://downloadcenter.nikonimglib.com/en/download/fw/562.html