I bought a DVD to replace the CD-ROM in my lapop.
Used the software on the previously mentioned firmware website to identify the firmware version (the software confirmed the lockable status of the drive), downloaded the appropriate hacked replacement and reflashed the drive.
Now I have a region unlocked drive.
Caveats:
Make damn sure you identify which firmware version your DVD drive has and be very certain you download the correct replacement.
If a laptop then make sure your battery has full charge AND that you're plugged into the mains. A power interruption while still flashing the drive will probably render the drive useless. Not much you can do about it with a desktop unless you have battery back up power supply.
According to some websites some drives can become permanently locked ie unflashable after a certain number of different region disks are played. It's better to reflash prior to playing more than one or two disks.
Hope it goes well for you!
T.