Hello. I have purchased two of your upcoming mode cartridges and wanted a Mega SD as well but they were sold out. So, I purchased one off Ebay. Unfortunately it didn't come with a memory card so I do not have firmware. So, I came to download the latest and I am getting the message that my serial # doesn't exist? I used the one on the white sticker inside the cart. I saw where you mentioned later serial #'s may not be in the system yet? Is there a way I can download the firmware for my new cartridge so I can begin using it?