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November 22, 2010 // 12:09 am - A few days ago we saw a video of a PS3 downgrading, and today zAxis has released PSGrade which is a PSGroove implementation of PSDowngrade WIP for JailBroken 3.41 PS3 consoles.

Download: PSGrade - PSGroove PS3 Implementation of PSDowngrade / PSGrade Into GameOS System 3.15 / GIT

In related news, graf_chokolo has now detailed how to decrypt PS3 PKGs as noted HERE.

To quote: Today he's shared his work with the public, however, it still requires some work, before it is fully functional. Right now, his code still requires the dongle master key, one that is buried within the PS3 console. The good news, is zAxis feels this key can be retrieved via a 3.15 fw console.

He is asking the community, anyone with a 3.15 console, to help retrieve this key. Once retrieved, PSGrade should become fully functional. Below, is his request to the public.

To anyone who wants to help, here is what you have to do:

1- run the PSGrade I posted (just like jp)
2- reboot into linux (no power cycling!!)
3- dump HV (and post it)

If you dont know how to dump HV in linux, then google it (you will need to open your ps3 and solder it DONT DO IT IF YOU ARE NOT AN EXPERT!!!)

Once you get the key, post it in key.h and try it.

Please remember, this is a work in progress, nothing is working yet (so don't ask for hexes), and nothing is for sure. Good Luck.

Oh, and thanks to graf_chokolo for ... everything, Hansi for the dump, and mathieulh for PSGroove (PSGrade is a derivative of PSGroove) and everyone else.

Update: Thanks to d0zs and Tripleblacklac, PSGrade is know confirmed to initiate the challenge/response protocol on 3.50. What that means? it means that once we have the right key, 3.50 will be in service mode using PSGrade. REMEMBER we don't have a working key yet, so no service mode.

According to graf_chokolo, to get the ps3 to decrypte the master key, then you have to call "Verify Response" and the master key will saved in plain text. it is called when plugin a jig, and that is what PSGrade is.

Once we have the key, we will have a working jig :-) And no 3.41 is no good even if you have dump the HV. Here is my discussion with graf_chokolo:

PSGrade - PSGroove PS3 Implementation of PSDowngrade Arrives

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#47 - PS4 News - December 7, 2010 // 7:05 pm
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As it is now released, resume discussion here guys:

#46 - farenheit - November 25, 2010 // 7:17 pm
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For a start posting the key is "illegal" so there might just be someone out there sitting on one dumped by one of the methods out there but not too keen on having ynos on their backs... (although it would be put out in the wild like the rest of YNOS files...)

Besides its not an easy process dumping the key. However we shouldn't be too far now as Graf_Chakaloko has just got his PS3 on 3.15

Let good times roll!

#45 - hackerxide - November 25, 2010 // 3:04 pm
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This is great news that we are close to a downgrade, what I don't understand is why isn't this the top thread on the ps3 hack forums, I mean if i could help the scene i would but i have two ps3's with 3.50.

#44 - MRDOCA - November 23, 2010 // 7:26 pm
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i can't believe there's still no key dumped, where is everyone?

#43 - ersatz100 - November 23, 2010 // 6:15 pm
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that key is encrypted, wont do any good.

#42 - mushy409 - November 23, 2010 // 5:15 pm
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Sorry, forgot to attach the hex...

#41 - is0mick - November 23, 2010 // 10:34 am
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Not long got up!

I've still got a 3.15 with the memory bus wire still connected, and my atmega8 so dumping wouldn't be a problem..

However I don't have a to run the first part

#40 - mushy409 - November 23, 2010 // 3:46 am
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Quote Originally Posted by sk group View Post
why is this taking so long?

I wish I could help you, my PS3 is currently on 3.50 although its WAS on 3.15 before hand (NEVER let your girlfriend touch your computers!)

Back to the source code... I'm using Pic C Compiler which is the same I used to compile the other psgroove sources. Anyone managed to compile it? I used the master key posted earlier in this topic.

Think I sussed it. Ran the makefile under command with winavr & it compiled with no errors.

I've uploaded the hex for someone to try out. Key has been added to key.h

USB Dongle Master Dummy Key:

[Register or Login to view code]

More than likely this won't work as it's only a dummy key - if someone can get those 3.15 dumps sorted then we can start compiling!

#39 - bitsbubba - November 23, 2010 // 3:23 am
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since the P3go is open source now will it or iPod be able to do this?

#38 - evilsperm - November 23, 2010 // 2:29 am
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Quote Originally Posted by febag92 View Post
But you must have a SX28 to send the pulse! Good luck

Not any more you don't...

You can do it with any of our avr boards by shorting out the chip.