Have a look at this page of Goodmans Hacks...Although your player is not listed, there are Hacks for Models Numbers Close to yours ...and the Hacks seem to follow a similar pattern for most of them....you might find one on there that works for your Player.
1. Press the Open/Close button on the remote control.
2. Using the remote control, key in the following: 2, 8, 1, 2, Enter.
3. Using the Down button on the remote control, select the Country Code option and press the Enter button.
8. You will now be presented with four dashes, press the 1 button on the remote control for region 1, press 2 for region 2, and so on, or press 0 for region free. Try 9 if 0 does not work. Try 255 if 9 does not work.
9. Press the Enter button on the remote control.
10. Press the Open/Close button on the remote control.