open the tray;
type 8926 (asteriscs will appear on the screen)
type the zone number (1 to 6) or "0" to zone free(some say it's macrovision free too);
press play (the tray will close);
it's done!
If you type 8926-7, the firmware version will appear on the screen and if you type 8926-8 the DVD configuration is set to factory default.
If you are unsuccesfull with the above code then it may be worth trying one of the resources below.
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