I have HP CD-Rewriter+ 9100c (8x/4x/32x), firmware version H2,1. Many IC on PCB is from Philips, PCB marked as "Philips Hercules 3" and I think it's rebaged Philips CDD4801. I find Philips firmware v2.5 (file with .cvt extension), but I can't upgrade drive. Philips FlashTool v22.214.171.124 wrote: "No supported Drives found", then I tried DOS utilities - Ataflash and Flashhp (FlashCmp). My biggest hope - Ataflash v1.3 wrote "No atapi device found". I tried other IDE port, and other motherboards, no difference for this drive. And finally Flashhp wrote "No Supported Drives found!". And now I want help. Have anybody modified FlashTool or Flashhp? Or other flash utility with cvt files format support?