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After a quick look around, the following remote control sequence should unlock the restriction on this LG DVD player:
- Press "Open" to eject the DVD tray
- Press "0" three times.
- A region test screen should now appear.
- Now press "0", "Pause" and "Open" in sequence.
One post I came across said to wait 1 second between each press of '0', so if this doesn't work, try again, but wait a second or two between each key press.