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I have a Ps3 On the latest official firmware 4.21 However I was reading about the "HDD Decryption" Method. Is it possible to host a call of duty mw2 challenge lobby using this?
Another Question is how do I obtain Grafs Git as graf_chokolo was forced to remove it but some people have mirrored his files so is it possible that I could obtain them and could someone provide me with a detailed guide on how to install it aswell

Thank You

No, this got patched in the 3.61 update. There was a similar thread like this posted not long time ago, search before posting this noob question.