Passcode for factory reset?

I'm about to sell my phone so I need to do a factory reset to my iPhone which ive had from brand new and have been the only owner of this phone.
When I click reset all setting its asking for a passcode but I don't know what it is?

iPhone 5c, iOS 9.3

Posted on Mar 22, 2016 12:19 PM

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Passcode for factory reset?

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