I was doing a downgrade on my iPhone 4 when the downgrading stopped at the middle with the system saying “error 1600”. Now my iPhone has a black screen and I can’t turn it on. When I connect it to the computer, iTunes automatically says the device is in recovery mode, and I have to restore it. If I want to restore it normally with the simple iTunes I have other problems with “error 3194” or “error 2005”. I don’t know what to do now, please help me.