Reset All Settings; Firmware Version - Nikon Z 50 Reference Manual

Reset All Settings

Reset all settings except Language and Time zone and date to
their default values. Copyright information and other user-
generated entries are also reset. Once reset, settings cannot be
restored.

Firmware Version

View the current camera firmware version.
326 Menu Guide > B The Setup Menu
G button ➜ B (setup menu)
G button ➜ B (setup menu)