(adsbygoogle = window.adsbygoogle || []).push({}); Well, I can confirm doing a System Restore does not downgrade your firmware, it just deletes everything. So, CFW (Custom Firmware), is the only way that people who have updated to the 3.21 update will be able to downgrade. So, how do we get a CFW? Geohot has supposably created Custom Firmware, but he is not releasing anytime soon, so I decided to try myself. Well, I have 2 ideas:

Idea 1

This is the easier method. You download the 3.15 custom firmware from here: You must login or register to view this content.
To download you have to register, but I will eventually rehost the files on MediaFire. Then, open up the PUP file using a hex editor such as HXD, and search for the firmware version. I already know it's there. You then try and replace the firmware number to one higher than 3.21 to fool the PS3 into thinking it's an update. I tried 3.22, but that just seemed to corrupt the file, and it won't read on the PS3. My idea is that as this update is non-existant it doesn't work. Therefore, can someone try changing it to 3.2100 like Geohots firmware version? I know this adds bytes, but it's worth a try. You then copy the PUP to a memory stick, and update via removable storage.


Idea 2

This is more time consuming, and I don't have a real clue if it will work. What you do it download Firmware versions 3.10, 3.15 and 3.21. You then compare 3.21 and 3.15, and find any differences. You then compare 3.10 and 3.15, and find the thing that was different in 3.21 that is the same in 3.10 (which hopefully, the only thing that fits this requirment is other OS). We then take the code that enables Other OS, and paste it into 3.21's PUP. We already know you can update 3.21 to 3.21 via removalbe storage, so this could work. Where would you actually put this code in the Firmware? I don't know, that's why this isn't a release.

Neither method should 'brick' or break your PS3, as mistakes will just corrupt the update and it won't read. In order to install the updates, create a folder called PS3 on the removable disk, and make a subfolder called UPDATE. Make sure both PS3 and UPDATE are in Capitals. Then place the PUP file into the UPDATE folder. Also, make sure the PUP is called PS3UPDAT.PUP. Post any questions on the above, or any advancments below. Thanks

Allegedy, the firmwares I linked are dutch :S MasonF123 kindly gave me the US links. They are here: You must login or register to view this content.
Again, they need registeration, but like I said, I will upload the files to MediaFire a.s.a.p.

dude come on, why would you open a pup file in HXD? its not cod, the pup file would have its own encryption anyway so if you try to change anything you will just get file corrupt, if it was this easy dont you think the PS3 would have been hacked by now, not even some hacking features can be done by HXD on cod let alone hack a console, go 2 ps3-hacks and read their forums, u will learn ALOT.

geohot is a douche anyway, he did pointless things for the ps3, got rid of otherOS for us, got rid of bypassing and apparently made his own custom firmware. if it was true why not release it. it obviously "works" give the people back what you stole from us. DICK!!

wish this worked it would be beast

I agree. This is rediculous.

nice idea you figure it out pm me the tut lol

what if sony didnt remove the other os feature and all they done was hidden it from our sight like you hide folders on your pc thats probably doable in an update, they might be playing a great missdirection trick on everyone. you could all be looking for something thats been removed but its only been hidden so its still there in the code

Ill try this later and leave some feed back on what i get