Works for many LG DVD players as far as I can gather including the V9122W VCR/DVD Combo I picked up today here in New Zealand factory set to Region 4.
LG Region Free hack
To Change the Region Code -
1. Power DVD/VCR on. Wait for "disc" to be displayed
2. Press the Pause button on your remote control
3. Using your remote control enter the code 3, 1, 4, 1, 5, 9
Note: If your unit does not enter the following mode which enables you to enter a region code, repeat steps 1 and 2. You may need to enter these codes in a shorter time span for them to work.
4. Press the 0 button on your remote control for Region free, 1 for Region 1 or 2 for Region 2.
5. Press the Pause button on your remote control
6. Power off your player and wait a few seconds
To view the firmware version -
1. Power on your player
2. Press the Setup button on your remote control
3. Select TV Aspect and place the cursor on the 16:9 Wide option
4. Using your remote control enter the code 1, 3, 9, 7, 1, 3, 9
5. Press the Enter button on your remote control
You should now see the version information screen