Downgrade from 4.2.1
Hi, first off, I do apologies if this is in the wrong section, or is a over asked question, but I've searched for answers with no luck.
Last week, my IPhone 3GS (jailbroken by my friend), decided to nearly die, staying on the connected to iTunes screen. I know very little about this scene, so I managed to get 4.2.1 installed and jailbroken. All was fine until I realized my signal was poor and no service at work, where I had full 3G signal before.
After speaking to a friend, and using common sense, it must be the firmware update. My problem is, because my friend jailbroke it first, he didn't save the SHSH blobs, and I did not do my research properly. So I can't downgrade using the blobs. I cannot find any method to get down to iOS 3 without using blobs, and was wondering if anyone had any tips or methods to help me.
Any help is greatly appreciated, thanks again, Daz.