Original Firmware for AOpen COM5232/AAH PRO

I flashed the wrong firmware on my AOpen COM5232/AAH PRO. The one available on AOpen website is for COM5232/AAH and I used it on my COM5232/AAH PRO. Now that the system will crash whenever I try to burn a blank cd. And there is no firmware on the AOpen website for this drive. If there’s anyone has the original firmware for this AOpen COM5232/AAH PRO drive, please let me know how I can get it. Thank you very much.