I'm not sure if this is how it works on the '2930, but what I did to check my firmware version on the '3930 was as follows:
- Making sure there's no disk in the player and the tray is closed, turn off the player with the hard power button.
Press the "Play" and "Open/Close" buttons at the same time and keep holding them while you turn the hard power button on again.
Release the two buttons after about three seconds and then pick up your remote and press the numbers 3-2-6-5 in sequence.
Finally, press the Menu and then the Display buttons on the remote and your software version should appear.