Ηi, I have an iphone 4 gsm that has ios 4.3.5 and I want to update it to any ios 6 that can be jailbreaken. e.g ios 6.0 , 6.1.2. I am trying to do it with Itunes but I get error 3194 and if I use tinyumbrella I get error 1604. Could someone help with what to do. thank you very much!