IPhone 5 - Technical difficulty (software update)?

I have an iPhone 5 and it was telling me I need a software update, so I began the update last night but my phone has frozen! It's just a plain black screen with the Apple logo in the middle of it, and the loading bar below it. It's been frozen like this for 15 hours.

I thought I'd just unplug it and allow it to die, but it's taking so long! I held down on the 'off' button for a whole minute and it wouldn't turn off, and I don't know what else I can do!

Hold down home button and power button until it reboots. This should fix your problem.

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