The file can be downloaded from the download section of the product page. 

Please note: to install the software you must use a FAT32 formatted USB stick.

1. Save the firmware zip file to your desktop
2. Extract the file
3. Copy the extracted .FW to a USB drive
4. Safely remove the USB drive using the safe eject option in the taskbar tray
5. Place the USB in the USB port labeled - MCU Update
6. Enter the setup menu, scroll to USB Upgrade, then select Upgrade All from the list
7. Once completed you can remove the USB drive.