restore mine to factory please

Hi I wanna restore mine to factory please, it wont let me, I tried removing it in nito then removing bits in settings but it keeps saying error, pls help I need to make it factory, it is the 2nd edition black

You need to put it into DFu mode just as if you were going to Jailbreak the system, but at the iTunes restore stage use the apple supplied .ipsw file rather than a jailbroken one.

thanks, in the end I connected  it via usb to iiTunes and restored it to factory settings, I now have the new iOS and Netflix