Power on the player with no disk in the drive
Wait for "No Disk" message to appear
Press PAUSE and ENTER on the remote
Enter 3, 1, 4, 1, 5, 9 on the remote (the wode COdE or FF appears on the display)
Enter 0 on the remote (0 = All Regions, 1 = Region 1, 2 = Region 2 etc)
Press PAUSE on the remote
Power the player OFF, wait 30 seconds and then power back ON.