Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
Honestly, there isn't anything you can do in this case. The problem here is that the player is designed for and locked to a specific region while you're attempting to play a disc from another region. These region codes were set up by the movie studios to help prevent piracy, and there is no easy way around them.
This region coding protocol is physically built into the hardware (chips on the control board) of the player, and changing it would require physical modifications to the player (swapping out chips) that would void the warranty and often permanently damage the player. Your particular player model is hardware coded to the AU region and cannot be altered with any software or unlock code.
Your best options are to re-purchase the discs you want to play in your country with the proper region code, or buy a purpose made region-free player that does not have this hardware restriction.
I'm sorry there isn't a better answer here, it's simply a design limitation of the player.
Best regards, ***** ***** for the news,
I am an independent technician and I've spent my personal time, unpaid, in a good faith effort to assist with the question for which you solicited my services. I am only paid for my efforts when customers such as yourself leave positive feedback for my work. Again I apologize there is not a better outcome here, though this is really beyond either of our control. I do hope you’ll consider leaving a positive rating for me, rather than “shoot the messenger”, so that I may get credit for my time spent in good faith to answer your question accurately.