Finally, after alot of nights looking at HEX editors until your eyes started dreaming in HEX and tons of people working together figuring out the format of the DRL1/DRL2 files that get destoried by the downgrading process for some reason on the 256mb NAND PHAT PS3 consoles.
A confirmed way to restored your blu-ray playback has been posted in the wee hours of the morning, when everyone should have been busy dreaming of their XMAS gifts, but in a way this a special XMAS gift for all PS3 consoles!
Please note, that this is just a rough way to get you back up and running and you need to be handy in using a PC with a Blu-Ray Reader and a HEX editor, but these hard-working PS3 developers are working on building a easy tool to make the steps much more easier for all the PHAT PS3 owners waiting.
UPDATE #4: Since tons of people have been using the PHP script to fix up their blu-ray playback, you might be able to do the same if you lucky enough to own one of the same movie titles, see here for list of already ready to download titles:
SHOW TITLES --> http://arodd.com/showtitles.php
UPDATE #3c: Many people have been able to restored their Blu-Ray playback by following the HEX editing steps below!
But now thanks to the helping hand that Arodd has offered he now shares with us a easy to use PHP script! Where you can upload your MKB file and it returns a custom built DRL just for you to use on your PS3! Now updated to v1.1!
MKB to DRL Script --> http://arodd.com
For this to be successful you need to take your original blu-ray movie discs you own that you have played on your PS3, and you need to find the ones with the highest MKB value and then try out those resulting DRL's on your PS3 until you find the one that you had played that in fact updated your drive! -- Read the following to try to understand the logic:
And then insert your blu-ray disc, and it appear on the screen, then just navigate on /dev/cdrom/AACS/ and grab the MKB_RO.inf -- It's just another way for people don't have Blu-Ray reader on their PC!
More Technicial Info: Project #PS3bluray --> DRL Reversing / MKB Reversing / CRL Reversing
THE FIX: Arodd's original post has now been updated it to make it clearer to follow, but PLEASE note now that easy to use tools have been released, it is only there to inform you more on how this fix works: