Here you are:
Open tray and wait 10 seconds
Press 2, 1, 6 and 8
Change region via menu using the Enter button, 9 represents muliregion
Close tray
If it`s not co-operating then try:
Empty DVD tray
Using the remote control, press Setup
Type 1,3,6,9
The current Region Code is displayed
Press Up and Down keys to change
Change to 0
Exit by pressing Enter
Exit Setup by pressing Setup