My brother's friend gave him an iPhone 4, and it's disabled. All we can do on it is slide the lock screen to call for an emergency. We've tried to connect it to iTunes and it's not working; it just says "error." At first, it said iTunes needs to be updated, so we updated it. Then it says "iTunes cannot connect to iPhone because it needs a passcode." It tells us to enter the passcode and try again, but the iPhone itself doesn't let us do that. I want to make the phone work for my brother.