How to restore my iPhone 3GS if my power button is broken and it keeps rebooting?

I have an iPhone 3GS (bet no-one guessed that!). I jailbroke it a while back, and all was good. Well, except that when it was plugged into the computer, it would keep rebooting every now and then. It wasn't a huge problem though. As of recently, I've been unable to sync my phone to iTunes and/or update apps. I've had trouble finding out why or locating a fix, but the primary thing I suspect for various reasons is that it's still 5.1.1 iOS. So I want to update it to 6.1.2 then re-jailbreak it. Unfortunately, I can't restore it using an IPSW because it reboots during every attempt. I can't put it into DFU mode for a workaround either though because the power button is broken. So I need help! But I need dynamic help like this, where I can explain my situation properly. Not just an FAQ of Apple's or various other people's not-so-identical questions. Anyone able to help?

Download Redsn0w
Go to Extras > Even more > DFU IPSW

go to DFU mode and you know the rest.

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