Hello, good afternoon, I have an iPhone 4S, yesterday try restoring the phone in itunes, that had already days giving me problems, the issue is not restored me gives me error -1 all the time, I prodabo in dfu mode, two computers, mac in windows and nothing, always the same error and not know what else to try, when I get the error is in the step that makes restoring iphone firmware, the phone screen turns off and goes to the error message iphone could not be restored. There was an unknown error (-1). Someone may take me a hand, I fear having a expensive paperweight, thank you very much, greetings