Iphone 4 has a iTunes account activation on it how to bypass this?

I updated my iphone 4 to the newest version yesterday then iTunes said it can't read your phone and telling me to restore it so I restored it and now my iphone says I need the iTunes account to get into the phone the original owners iTunes account I don't know it so how to you get into my phone without knowing the iTunes account

Same thing happened to be when I sold my 4s, you need to contact the seller and ask them to remove that phone from their itunes

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