21w ago - Nearly two months after the previous update, today I have posted a guide and video on how to downgrade a PS3 4.31 OFW console (including CECH-300x slims) to 4.30 Rogero v2.03 CFW using a PS3 Hardware Flasher with no 3.55 needed.
Very easy tutorial. Follow the steps to downgrade a PS3, but when you get to the first step of the USB downgrading part after putting your PS3 into service mode, use Rogero 4.30 CFW v2.03 on the root of the USB with the lv2diag.self to downgrade instead of the 3.55.
So again, no 3.55 ever touches the PS3 during this whole setup! Doing this will also now allow CECH-300x models original slims to be downgraded to 4.30 CFW as long as it never touches 3.55
The whole reason for this was to find out if the E3 fits a CECH-400xx model super slim models, but all I needed was proof that you can downgrade from 4.31 to 4.30 CFW with a flasher.
So if any one out there has an E3 and a new super slim model please test this if it works! You can make back ups of the NOR incase it fails.
Here is proof you can but I still do not know if the CECH-400xx models are compatible since I do not have one.
Step 1 - switch pup's with Rogero's 4.30 CFW v2.03 - my link has it set ready
Step 2 - lv2diag out of factory mode
PS3 nor dump patcher to fix bad back-ups
downgrade.bin - makes it rewrite the nor to allow factory mode access
update.bin - its the Samsung version of the flasher firmware, allows multi-console downgrades.. more than one console in other words
PS3 Flowrebuilder - decrypts the backups to look and make sure its good
Here is proof of me downgrading to 4.30 CFW no 3.55! My video is not cut but speeds up through the middle since it takes almost 2 hours to prove this. You see every time I drop the camera, fix the E3 and finish the downgrade straight to 4.30 CFW Rogero v2.03 which you will know it's spoofed to 4.31, you can see the install PKG / lastGAME icon after downgrading.
Hint: The E3 always has the ribbon starting under the NOR words (pictured below).
Always test your back ups and even use Flowrebuilder 4.2.2 to reverse decrypt to make sure your back up was good.
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i had another go at putting a custom firmware onto a newer 3000x series console this is what i learned. sony added a 2kb file called lv0.2 inside CORE_OS_PACKAGE.pkg in newer firmwares 3.60+ and it is checked by metldr.2 which is what new consoles have. this prevents downgrades and verifies the integrity of lv0. until we can decrypt and resign lv0.2 flashing different coreOS onto the console is not going to work!
lol i'm done bricking my console for the time. i guess i'm just going to wait until they fix this metldr.2, i even took the back up of a different slim ps3 on cfw rogero and pasted them over on the 3001, just another brick. its been almost a year now i believe and still no fix for this to be able to downgrade?
i only thought it was just the lowest firmware downgradable to not a metldr trouble. well i hope some one can fix this on these newer models. other than that my tutorial is good for all the older slims and phats to just downgrade straight to 4.30 rogero with out 3.55
make a backup of your console nor data and keep it safe, then download this and open both the download and your nor dump in a hex editor copy and paste the whole thing twice, once at offset 0c0010 and again at 7c0010 then save and extract with flow rebuilder everything should be fine then you will have made your console nor backup have rogero 4.30 coreOS
its been tried and tested by me, it doesnt work and will brick your console but you can recover by soldering the tristate wire and flashing your original 4.31 backup