PRISM DV-302 MODEL and MODEL DV 402 Hack
dont know if it will work on yours though use it at your own risk.
1. Press the Open/Close button on the DVD player to open the drive tray
2. Press the Setup button on your remote control
3. Using your remote control, highlight but do not select the Exit Setup option in the menu
4. Press the buttons 1, 3, 6 and 9 on your remote control, in order, one at a time
5. Press the Left button on your remote control, three times, in succession
6. Press the Right button on your remote control
7. Select the new Version option from the menu
8. You will now be able to change the value to 1 for Region 1, 2 for Region 2, and so on, or 0 for multi-region playback