1. Make sure there is no disc in the player and the disc try is closed.
2. Press Setup on the remote control.
3. Press Next, Stop, Pause/Step, Prev, Next on the player.
4. A new menu should appear. Go to SELECT REGION and make your choice of region or choose BY PASS for region-free.
For the 300, you may need to use the front panel of the player rather than the remote control.