You don't need a firmware hack to disable the 2X ripping limit. With the tray empty (and closed), hold the eject button on the drive in for several seconds, the LED will flash (green) 3 times. Release the button, the tray will open. The rip speed limit is now disabled until the drive is powered down.
This info is in the manual. (At least, it is in the manual for the drives sold in the US.)