I have an iPad running 4.2.1 and it's been jailbroken. I've been trying for a couple of days to upgrade to either 4.3 or 4.3.3 but no matter what I do it refuses to upgrade!? I've tried changing/editing/deleting lines from the host file and even tried on two different PC's but still I get the same 3194 unknown error message. Has anyone any suggestions? It's a frustrating error as everything I've read points to this being the lines in the host file (which is now free of the offending lines).