What are the steps to update the Nikon D90 firmware?

To update the Nikon D90 firmware, follow these steps:

1. Download the latest firmware update from the Nikon website.
2. Insert a formatted memory card into the camera.
3. Copy the firmware update file to the root directory of the memory card.
4. Insert the memory card into the camera and turn it on.
5. Go to the firmware update option in the camera menu.
6. Follow the on-screen instructions to complete the firmware update process.
7. Once the update is complete, turn off the camera and restart it to ensure the firmware is successfully installed.