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You need a root account in Linux for this! I used Ubuntu 10.04. The SDK is for Windows as well, but there's no readme for the files. So I set up VMWare with Ubuntu so I can use Linux inside Windows.

For Linux:
In Ubuntu, Fedora, Yellow Dog, etc, type "sudo apt-get install yum" in Terminal.
Type in your root password.
Now, look for a repository with PS3 binaries. You can get some from PS3Bodega.
You need the PS3 SDK kit as well, the full one. You can't get the full 600MB one from pretty much anywhere unless you search. I can't give a link since it's not allowed.
With yum and the RPM installed, now you can just type "yum ps3unpkgr" in Terminal instead of code editing.
When you get the SDK and install the binaries (the RPM is right there), you can use "ps3unpkgr -x <PKG name>" and unpack everything.
To pack it into a PKG again, use "ps3unpkgr -c <PKG name>" and it will pack.
I'm not going to sit and explain everything so thoroughly if you don't know how to do it. If you really are wanting more, reach me another way.

To do this in Windows:
Download the PS3 SDK.
Go into the "host-win32" folder.
Go into "bin."
In Command Prompt, drag "make_package_npdrm.exe" into the prompt, and use -x <PKG name> to decompress. Use -c <PKG name> to compress.
This unpacker will only work for certain PKGs! Luckily, the patch falls under this category.

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TinyPic resizing my monitor.. wow.

If you have it you can write blu-ray discs, etc...
I've told, only Sony have it!

No you can't, after you write a Blu-Ray, you must upload a config on DevNet.
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If you want, but you can't find the FULL PS3 SDK...

search the forum... a 600mb SDK has been posted, which as i said... either IS full, or is as full as we need it for patch editing

wy are you all trying this shit?
IT DOSN`T WORK

we can´t extract and repack the mw2 patch not with the old sdk´s witch are 2 years old AND the unpkgr is only for dev PKG´s and NOT for retail!
You wast thime nothing more.
So many people here posting "tut´s" witch they self didnt get to work or didnt tryed it.

So think about it we cant edit HDD and also not the PKG, BD or RAM so what can we edit an PS3?

savegame
Network traffic


so we have to try this ways

SAVEGAME.svg is single player bud, nice try.

i didnt say savegame.svg i sad savegame
there are more files
i mean the GPAD0_MP or GPAD0_CM maybe also the PARAM.PFD and PARAM.SFO

MP, no.
CM, no.
PARAM, it's called Savedata property files.

I think param.sfo will be the same as the package .sfo in the fact it will only contain version information, title ID, things like that that will not change much, if anything