Turn on the dvdplayer.
Push "open" on the remote.
Push remote number "1" four times (1-1-1-1).
A new menu should pop up now, select your region with the remote using the numbers, 0-1 for US, 0-3 for asian ann so on. Or 1-3 which will set the dvd in a "none" sone modus.
Push "close" (open) on the remote.
Turn the dvd off into standby.
Turn on again, and it's ready for use.
WARNING! Some discs can detect "none" modus and refuse to be played. If so, pull the cord for 5 seconds, plug in again and eject the disc. Choose now the correct sone manually and everything should go smoothly.