To experiment with Cinavia defeating, I purchased a used Sony BDP S580 standalone player from a seller on eBay for $35.00. Free shipping, and a remote, what a deal. (the remote even had good batteries in it)
I have a player of the same model installed in my home theater system.
I played my BD copy of the "Peanuts Movie" on the used player, and yes, the Cinavia disease warning appeared, as it does on my HTPC player.
Checked the F/W level in the used player, and it was set at M07 R0 624, as was the F/W level of my home player.
Some research into the sites described earlier in this thread, led to a list of Sony F/W files with the earliest in my series being M07 R0 600.
I used the "Easy Downgrade" utility also described earlier in this thread, along with XXX 600 F/W, following the instructions exactly, and was able to downgrade the used player F/W to 600 without bricking the device.
Played the "Peanuts Movie" again, and the downgraded F/W was able to ignore the Cinavia disease completely.
I played three more of my discs that would trigger the warning on the S/A player, and they passed the test also.
I downgraded my HTPC player after this test, and was successful, obtaining the same results.
My personal triumph in defeating my personal Cinavia problem, is due to the efforts of the forum member Nick64, and the man who wrote the utility, Malcolm Stagg.
Thank you both.
I have since obtained 3 more of the same model S/A player, modified them, and distributed them to my adult children and grandkids so they may enjoy the fruits of my hobby.
They were struggling along with Sony PS-3 devices which are all Cinavia infected.
Thanks again.
Art.