Try again in a couple of hours. I had a similar issue but it resolved itself about 8 hours later.
The Masso team are currently bulk creating accounts & firmware images. These activities are putting a huge strain on their systems.
For reference my G3 controller was purchased in June this year (G3-74##), if yours was purchased more recently it probably means the firmware image is still in the queue to process and will be uploaded shortly.
We all want the good stuff now but we need to wait patiently...