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PSGrade - PSGroove PS3 Implementation of PSDowngrade Arrives


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200w ago - 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 / [Register or Login to view links]

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: http://xorloser.com/?p=297&cpage=5#comments



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BwE's Avatar
#22 - BwE - 200w ago
Quote Originally Posted by 8bitbubsy View Post
That's what I meant - will it permanently downgrade a 3.50 PS3 to 3.41 so we can use PSJailbreak?

yeah buddy it's a proper downgrade.

metalphreak's Avatar
#21 - metalphreak - 200w ago
Reading through the PSGrade code, it only has a port5 device (which is the jigstick). There are no other usb devices with a faulty config descriptor which is what holds the payload in the usual jailbreak dongles. So obviously it's meant to emulate a real jigstick (which would work on 3.50).

8bitbubsy's Avatar
#20 - 8bitbubsy - 200w ago
Quote Originally Posted by sk group View Post
not properly. just enough to allow service modes downgrading capabilities.

That's what I meant - will it permanently downgrade a 3.50 PS3 to 3.41 so we can use PSJailbreak?

BwE's Avatar
#19 - BwE - 200w ago
not properly. just enough to allow service modes downgrading capabilities.

8bitbubsy's Avatar
#18 - 8bitbubsy - 200w ago
Quote Originally Posted by YadoMan View Post
Unfortunately this will only work on jailbroken 3.41 PS3s. This method can not be used to downgrade from the official fw 3.50. Maybe this should be mentioned in the opening post, before everyone gets their hopes up.

Why not? If we get the JIG key, can't we authorize even in 3.50?

I thought that's what PSDowngrade does - just a kind of clone of the Sony JIG with the genuine key? Remember that PSDowngrade actually works on 3.50.

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