Goodmans GDVD-124 region-free hack

Open the drive tray

Press buttons 7 and 4 on the Remote Control. If this doesn't work, you may have to enter the digits 7 and 7 instead

Press Enter

A hidden menu will appear where you can scroll down to Country Code and using the Select button, choose any Region between 1 and 6, or select 13 for Region free

Press Return to exit the menu

Thanks to Luke for the information