I am having a problem restoring my jailbroken iphone 4 (iOS 4.2.1). Itunes keeps showing error 3194 whenever I am trying to restore it. Do I need to enter DFU mode before restoring? The phone was tethered jailbroken via redsn0w. Can anyone help me with this? Besides, how to check if openSSH is installed in my phone? I am kind of worry that my phone being attacked by virus. Is my phone safe without openSSH installed?