code65536, thanks for your help.
Actually, the firmware I downloaded for WRR-52X is the one that flash into my currently dead drive.
For the past few hours, I tried various firmware to revive the CDRW. The best success I had so far was Lite-On 52x24x52x (CDR-6s52), which allowed Bios to recognize the drive. Of course, the drive didn't work :(.
I acatually called Artec (located in Tawian) and tried to get the firmware, but I had hard time communicating with the office.
Oh well, did anyone buy a Mad Dog 52X CDRW from Officemax around December? If so, can you please send me your firmware? Of course, I should really have backuped my original firmware...