I was giving support only to Diygadget's USB key extractor. How 74850c get their key is through extraction. So you have to select both an I/O Port and COM port. Switch the COM port to USB. USB Xtractor switch is grayed out because you are not using it.
If you want to try using it, connect up and turn on everything for the Xtractor Reader, install it's drivers, and restart JungleFlasher. Go to DVDKey32 tab, select your ports and checkmark "USB Xtractor Switch". Final step again is to hold the probe down on the correct R707 point and click DVDKey32 button. You need to use half-open tray to power up drive.