error message 1015

http://support.apple.com/kb/TS3694#error1015

Error 1015: This error is typically caused by attempts to downgrade the software for an iPhone, iPad, or iPod touch. This can occur when you attempt to restore using an older .ipsw file. Downgrading to a previous version isn't supported. To resolve this issue, attempt to restore with the latest iPhone, iPad, or iPod touch software available from Apple. This error can also occur when an unauthorized modification of the iOS has occurred and you're now trying to restore to an authorized, default state.

You're welcome.

Error 1015 usually means the iPhone was jailbroken which means hacked - an unauthorized modification of the operating system.