I have a 11.02 PS4 which came from 9.00, so a revert should be possible.
I was able to wire everything and dumping and writing the syscon and nor is working fine. I patched the nor and syscon, but after writing it back to the chips, I got following issue:
Starting PS4 -> Flashing blue light...
The other night was watching tv in my screened in porch, and heard something walking on my porch roof, thought maybe it was a raccoon, so I grabbed my rifle and went out to look, it was just a duck, lol