OS ROM Version 1.4 is available to K4 and K4r users by contacting Tech Support at Kawai US.(800) 421 2177 or (310) 631 1771. You must provide the serial# of your inst. and the current version which is displayed if you hold MASTER while powering up.The new ROM is free provided you return the old one in reusable condition and insure it. They will give you NO INFO but as I recall it is the only chip of that size on the board.Just pay attention to its orientation and use a good insertion/extraction kit. Let me know how it goes.