I know this is old but I have to tell you this!
I tried updating my Iphone to Ios6, got the recovery mode screen and then it got stuck there! Got error code 3194, ok, try again (about 10 more times) now I got error code -1. Tried google, tried EVERYTHING (dfu, tinyumbrella, ireb, irecovery,) you name it I tried it! People told me that -1 meant my baseband was fried and I could kiss my Iphone 4 goodbye (hell no)
After 2 days of trying stuff I was fed up with software and Itunes!
Here's what I did: I removed the battery - reinserted it - same issue
Then I removed basically everything else (my warranty is no more anyways so that didn't bother me) followed the steps from Ifixit. Made sure to attach all the cables and whatnot really good, connected it to itunes - restored
Oh my apple, it worked!