Id be very, very, very cautious about doing that. If any part of it doesn't work quite right you'll hard brick for sure.
If it were me, I'd try just the 4.1.1 rom first and only do that process as a last resort. I am curious if it would actually work, but I dont want to see anyone brick to try figuring it out!
But the Phone to CAM FW Write is still grayed out and camera isn't working.
After everything I did, I think it's safe to assume that it's the motherboard.