I've not seen any region code software hacks for Blu ray players.
From Wikipedia: Unlike DVD region codes, Blu-ray region codes are verified only by the player software, NOT by the drive and the computer operating system. The code is stored in a file of the player program or in the registry. In stand-alone players, it is part of the firmware.
There are companies that modify the hardware of some stand alone Blu ray players, changing the firmware of the players to be region free. Search Google for blu ray mods.