My cd-writer is Iomega CDRW9600INT-B and the firmware version is 5OS2. As suggested by dhc014, I tried to upgrade with the LiteON firmware.
I downloaded R245S5A.zip(http://www.liteonit.com/webfw/LTR-24102B/R245S5A.zip) from http://www.firmware-flash.com/~dhc014/oemcollec.htm
When I tried to upgrade I received a warning stating that the flash utility supports only LiteON-IT LTR 24102B drive with firmware 5S50-5S6Z. I clicked yes to continue. The message I got was
Can’t find LTR-24102B firmware: 5S50-5S6Z
Can you suggest me what to do?