You have to be on firmware 3.41 on your PS3 and you have to have an iPhone / iTouch on firmware 3.1.2 that is 1G, 2G, or 3G (I recommend a 3G). If not and you are looking to downgrade then check cydia and see if it has your SHSH's on file (it's at the top of the cydia homepage). If not, then I'm afraid your too late but if you have then great. If you have a 3G then it eliminates the need to download and install ubuntu on your iPhone / iTouch with VMPlayer etc which is a lengthy process. Here is the video link: [ame=
https://www.youtube.com/watch?v=B1w-F-JC7Lo]YouTube - PSFreedom on iPod Touch iPhone Tutorial[/ame]