i have a ipod touch 3G with 4.0.2 update. i really want to downgrade to 4.0 but i don't have cydia on there from before or saved SHSH files.( i've never jailbroken it ! ) I don't know what else to do! i've looked all over the internet and maybe i'm not understanding what exactly to do but please help. now i understand i don't know much about this stuff and i'm asking for help so please no rude or negative comments. thanks