It wasn't an add-on mod but a modded player. You buy the modified player from outfits like 220 and Bombay.
I didn't think this Sony was considered a standard player, it's priced more than most but less than the Oppo (till you buy the modded version).
I did some googling for a region free mod for this player and they're out there, but the markup is insane. It's puts it in the range of an Oppo. I think I can get the 203 from Opposite with a mod from eBay for less than this Sony.