How to fix an iphone 3gs that is stuck on loading symbol during reset?

I'm trying to reset my iphone 3gs and its stuck on the little loading circle and its still spinning but its been around 5 hours.

Use up all of the battery and then try again or of you want to try this right now then hold down power button and home button ( circle thingy) for a few seconds the phone will turn off and then back on and hopefully done! So power button and home button!

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