i want to downgrade from 5.1 so i can jail break it, (iPhone 4)
but i have no clue where to start, ive jailbroken my iPod touch 3g before on ios 4.x but that was all a blur and i have forgotten how to do it.
im reading all over the place about shsh blobs and stuff and i really dont want to brick my iphone.
can anyone help ?
Short version is that it gives you control and access to you whole phone and not just what Apple say you can. There are a lot of benefits to doing it but for most it's because they're too tight to pay for a 69p app and can get most of them for free once jailbroke.
Millions of people across the world run jailbroke iPhones but I wouldn't say most. It's a hassle, comes with some danger and for the average none geeky user they just don't care or need to.
Basically if you're not running in to issues using your phone as it comes and can't think of a benefit to jailbreaking it then I wouldn't bother. I've not been jailbroke since the beta of iOS 5 and there's little tweaks I really miss but I can live with vanilla.
As far as im aware youll need to have saved them blobs from 5.0.1 to be able to downgrade back, blobs are individual to you. So you wont be able to downgrade without them