The problem with patching your drive (if a patch is available) is that if something goes wrong, then you may end up with a rather expensive door stop. So, if you attempt to patch your drive with an unoffical firmware and something goes wrong, you will not receive any help from your drives manufacturer. For this reason, it may just be easier to use a program such as VLC (as linked above) that allows for region free playback with any drive without any modification to the firmware of your drive.