Pioneer 107D Downgrade to 1.05 firmware to 1.09 , need help

HI OC-Freak, I just upgrade my Pioneer 107 to firmware1,09 which has 1,05 firmware initial. But i want to go back to 1,05 patch by nill or the official one. Pleae help me. I tried with dvr-flash but i could not make it. Thanks

silly question: why would you want to do that when there’s firmware 1.10 (both official and patched)?