I recently tried to downgrade my 4.3.5 iPhone 4, to 4.3.3 I followed this tutorial, http://www.redmondpie.com/downgrade-4.3.5-ios-to-4.3.3-4.3.4-4.3.2-4.3.1-4.3-iphone-4-3gs-ipad-2-ipad-ipod-touch-4g-3g-how-to-tutorial/ When i went to edit my hosts file, I noticed, unlike the example, mine already had this string of text: (#220.127.116.11 gs.apple.com) where I was supposed to paste the text from the example..which is ( 18.104.22.168 gs.apple.com ). Stupidly, I just pasted the text below what was already there and tried to downgrade. It finished, then I got the 1013 error. I tried to kick it out of recovery with TinyUmbrella and RecBoot, neither worked. So I ended up restoring the host file with the back up I had, and restored my phone to 4.3.5 back where I started. I have my SHSH blobs, at least I think.. before I updated to 4.3.5, I saved my blobs with tiny umbrella. It says I have 4.2.1 through 4.3.5 saved, so this should enable me to downgrade, correct? How would I get this to work? What did I do wrong or what do I need to change? Do I need to have my iPhone on 4.3.5 jailbroken to downgrade it? and last but not least, once I do get it downgraded will I be able to sync a back up from my iPhone on 4.3.5 of all my pictures, contacts and everything back on my phone? Sorry about the long post and all the questions! I've been jailbreaking for a long time, but have never downgraded. Thank you!