I can't master reset my iphone?

I have a 3gs iphone and i wanted to restore factory settings and then update it, so first i tried to do it directly from my iphone but the apple logo appears and then the processing symbol appears and it was stuck there for half an hour, then i turned my iphone and then tried doing it via iphone and it just gives me the error 3914

Try this,
m.wikihow.com/Hard-Reset-an-iPhone

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