This hack apparently works for the Digiquest DVD 2000, so it must be worth a go for your model
1. Open the disc tray
2. Press SETUP
3. Press the button for the desired RC (9=codefree)
4. Press 2, 0, 1, 0 (or 3, 0, 1, 0)
5. Press STEP, SHUFFLE, NEXT CHAPTER
6. Close the disc tray
It would be helpful if you post below to let people know if it works or not :)