Q: error 3194 when i restore my iPhone

Make sure you are not using proxy server and you are updating to the latest IOS and using latest version of itunes, and try again. if the same issue still presist; you will have to restore your device in DFU mode "check youtube for restore in dfu mode"

The 3194 error indicates that you are trying to use a firmware that is not made for your device, generally from attempting to downgrade your iOS. See this support document. Error 3194, Error 17, or "This device isn't eligible for the requested build" - Apple Support