Nikon D300 Quick Start Manual page 6

Upgrading the Firmware for the D300
During the update, do not:
Any of the above actions could cause the camera to become inoperable.
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Remove the memory card
Turn the camera off
Operate any of the camera controls
Attach or remove lenses
Unplug or disconnect the AC adapter
Remove the battery
Subject the camera to powerful electromagnetic noise
Insert the memory card containing the firmware into the camera.
Turn the camera on.
Press the MENU
button and select
Firmware version
in the setup menu.
The current firmware version will be
displayed. Highlight Update and press the
multi selector to the right.
A firmware update dialog will be displayed. Highlight Yes and press OK to
begin the update.