It is a 3500( you lucky dog) Just go to the Mad Dog site and download the latest firmware and the Utitily at the bottom of the page. Install the the firmware, reboot and open the utility and run the bitsetting for +R to DVD-ROM and you should be good to go . After a while you may want to use one of the modded firmwares (will void your warranty) I think I am using one of Liggy's firmwares (2F3 Fast, I think) and it works fine.
Edit: Good scan, looks like you have things under control. Happy Burning! :bigsmile: