Download Purple Restore 3
Purple restore apple internal software is very hard software to find, this is not latest version but is a 100% funcional for El Capitan, did not test on sierra.
PurpleRestore is a tool used by Apple to restore or reset iOS devices, especially for engineering tests.
To use all this software potencial you need special IP or VPN to confirm you actually are working on Apple.
IMPORTANT!!! Please note that this a blog for educational purpose only. By reading this, you agree that I’m not responsible of what might happen with the use of informations provided. Use this software at your own risks. Also, i found this software using google.
credits to @info_iosx thanks for the download link