I have a first gen iPod touch which is stuck on iOS 3.1.3 or something like that. When I say stuck, I mean iTunes says it's the latest version for my model. I don't know what this jailbreaking malarky is but will it enable me to put iOS 4 on or will I have to upgrade to a new model (which I don't want to do as it still works damn well nearly 5 years on, thanks)?