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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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#37 - BwE - November 23, 2010 // 2:18 am
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why is this taking so long?

#36 - barbnjason - November 23, 2010 // 1:48 am
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For anyone asking about the HV dump and the solder point have to look no further than this page from way back machine, this is where everything as we know it today got its start.

GeoHot Releases PS3 Hack, Exploit Your System and Enjoy!

#35 - ju2ef - November 23, 2010 // 12:13 am
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Can u read the key from original PSDowngrade dongle?

#34 - ameer1367 - November 22, 2010 // 11:24 pm
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solder points. correct me if im wrong but i believe its the geohotz solder method or infectus chip.

#33 - febag92 - November 22, 2010 // 11:17 pm
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Here is a Tutorial:

But you must have a SX28 to send the pulse! Good luck

#32 - junior2k9 - November 22, 2010 // 10:29 pm
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ps3 stinger (clone chip) also apparently has a downgrader, they are suppost to set pricing this week I believe.. was browsing around and saw that yesterday sorry to go off topic... I do have a ps3 on 3.01 and wouldnt mind upgrading to 3.15 where can I find out what spots need solder?

#31 - YadoMan - November 22, 2010 // 10:26 pm
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Good news, there has been some testing of zAxis' PSGrade, and it may work on 3.50 after all.

And the jailbreak guys are now planning to give away their downgrader for free (as they should have in the first place), and are lowering the MSRP of their USB stick from 125 to 99 USD. That can really only mean one thing: They have already tested PsGrade with a working key (which they have), and it does indeed work. And now they know the JIG is up.

#30 - febag92 - November 22, 2010 // 9:40 pm
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You must run the PSGrade program in FW 3.15, go to Linux under OtherOS, and then use the Geohot's exploit to dump the HV!

And as you might remember, you must open your PS3 and sold a piece of hardware in order to be able to dump lv1!

KaKaRoToKS is able to dump all lv1 calls, but that requires a reboot in order to load the payload. So right now, the only way to dump the key is using Geohot's Exploit!

Hope someone is able to do it soon

#29 - pip1 - November 22, 2010 // 7:36 pm
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if you're trying to compile what I posted, its not source code at all. if your trying to compile the origional posters files, there incomplete thats the whole point of the thread to fill in the "blanks"

I misunderstood the first post it should compile, but with what I don't know except for the same tools psgroove can be as its a psgroove derivitive.

#28 - farenheit - November 22, 2010 // 6:57 pm
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The information you have posted is graf_chokolo's original HV reverse engineering details:

Nothing new.