Firstly, I'd like to say thanks to the people who developed the untethered exploit. Now, onto the fix, which I just tried. Background info: Well, when the tethered jailbreak just came out, I got pissed because error 1604 kept stopping me from completing it. Now that untethered has been released, my hope was renewed, and I continued my search for a fix to this error. I found it in the form of extra information in iLove's easier version of shortperson's untethered tutorial (I'd provide a link but I'm too lazy). Method: I don't know chich one did the trick, but all I had to do was restore to a clean 2.2.1 FW before doing the prejailbreak patches, and also terminate all apple processes via command prompt. Hope this helps someone! Please post whether or not it worked Please Register or Log in to view images Edit: I'd like to say thanks to Dancool999, whose GUI I used, and iLove, for providing that simple, yet needed piece of troubleshooting advice.