Okay, so I'm kind of a n00b with alot of this stuff, but I think I understand what an SHSH Blob is (a file used for Apple to verify the current firmware on the device, or whatever), but what I fail to understand is why Blobs need to be saved as you accumulate them. From what I've found, in order to JB my iPhone 4 (with the untethered JB, which I understand hasn't been released yet), I need to have my Blobs saved from 4.1? But I never had a JB on this phone before, nor did I save those Blobs. I've saved the Blobs I currently have (idk if I needed too), but what I'm asking is: Will I be able to apply the untethered JB for 4.2.1 (once released) without having previously saved Blobs? and if I'm failing to understand what/why I need the Blobs, please feel free to explain that to me. Thanks.