The sonydvdrw10ax oem is the firmware same as 500 range

there seems no firmware support from sony for people like me who have a manufactered pc with the sony oem multidrive 10ax will only write at 1x although i wonder if this is the data write yellow tops i am useing. there are unofficial sites but i dont want to cause myself more grief.i take it that the firmware for the 500range of sony multi dvdwriters are toally differant firmware wiseto mine colin.