You can update the firmware on the NXT directly from the ROBOTC application. To update the firmware, follow these instructions:

Prerequisite: Make sure that your NXT is connected to your computer via USB and is powered on with a fully charged battery.

1. Open the "Robot" menu and select "Download Firmware."

2. Since NXT is set as the Platform Type, the "NXT Brick Download" screen will appear. From this screen you can rename your NXT and update the firmware. Make sure that your NXT appears under the "NXT Bricks Currently Connected via USB" list before proceeding. If the NXT does not appear, make sure it is connected via USB, powered on, and that the NXT USB driver is installed. Then click the "Refresh Lists" button to see if your brick can be found.

3. To start downloading firmware, click the "F/W Download Button."

4. After clicking the "F/W Download" button, you will see the "Select NXT firmware file" file selection screen. ROBOTC will automatically open to the Firmware folder and show you all of the available firmwares available for the NXT. NXT firmware files have the extension ".rfw". Select the highest numbered firmware file that follows the "NXTXXXX.rfw" format. Once that firmware file is selected, click the "Open" button to start downloading the firmware to the NXT.

Note: Always select the highest version number available with the "NXT" prefix.

5. As the firmware is downloading, your NXT will shut itself off and turn itself back on. Once the firmware has been successfully downloaded, you should see "Firmware download completed" on the "NXT Brick Download" screen, under the "Message Log". Your NXT is now ready to be used with ROBOTC.