HI frnds, when i use cydia on my ipod touch 3g i get this in starting:- This device has SHSHs on file for iphone os: 3.1.2, 3.1.3, 4.0. What does this mean. Can i upgrade to ios4 & JAILBREAK IT. & if i can jail break will i be getting a untethered JAILBREAK & which software do i use to jailbreak????