Have you tried connecting it to your PC and updating/flashing it for downgrade? If it has the ATmega32L chip you may find it will not work with the DYN-001 motherboard found in CECH-20*** PS3 Slims.
No its not ATmega32L chip. I tried to download the file from E3-tech. but all brocken link. can any one help to program PS3 JB2 for entering fsm