SONY ENTERTAINMENT is a B***** when it comes to Piracy and Prevention.
They are quite strict about the formats they approve. Even if you get to change that chip; what about the software?
I do not see how you can succeed - I have tried to research how to make my PS3 play PAL videos but to no avail. It can play other stupid regions - but not my good old PAL.
The whole of Google says -- "not possible" --- or channel through your PC etc..
So what do I do ? I have a fake Chinese DVD player (with USB) to compliment what the Sony Players cannot play on those occasions.