How to do it?

1. Open the CD tray (eject button).
2. Push 0 (Zero) 3 times quickly in a row.
3. The region selection menu should appear (if not, go back to point 2)
4. Type 0 (Zero) at the region selection menu to set your DVD Player free for all regions.
5. Hit Enter on your remote control
6. Shut down the player
7. Start your player again and enjoy DVDs from all regions

That's it.

For other Players try the descreptions on this french page:
http://www.club-dvd.net/modules/wordbook/