The DVDFab list says firmware FR07, TST0, BU10, CA03, or A100 is required. Not sure if "A100" is actually 1.00, I will ask the developers to verify it. Sorry you are having some problem with it. I am not sure how you would downgrade from a 1.00 firmware in any event (other than crossflashing). The devs generally recommend the full size LG drives, I have two of them (the USB 3 BE16NU50 fw 1.01 and a BH16NS55 fw 1.02 or lower) that both work flawlessly with DVDFab, Passkey and DeUHD. Also, what are you using to read the firmware number from your drive?