I don't know how people do it...I sat for 5 hours trying to downgrade from 4.3.5 to 4.3.2 to be able to jailbreak and failed. I was so close at the end. I passed all the errors (3194, 20, 1013 or was it 1015). 4.3.2 was loaded and I got that final iTunes error you're supposed to get. I just couldn't get my iPhone out of DFU mode. I tried the tinyumbrella fix "fixrecover43.exe" but it failed when it could not fetch the DFU image from Apple's servers. I have no idea why this is? This was the last straw. I couldn't use TU to kick me out of recovery mode nor could I use this solution. I Googled for hours but there is so much information out there that is outdated. I had to give up. If anyone knows how to fix this...i'd be so happy.