As far as I know, there is no unlock for the volume. If you go into settings there is a volume limit. If you go to it just scroll up to the maximum and press the center button. That's maximum volume set. Then play a song and scroll the volume all the way up. If you're still not getting any sound then your headphone cable might be broken. Try the iPod on some sort of docking bay that produces sound. If it works on there then you definitely have a faulty headphone/hold cable. If it doesn't work on the docking bay, then you have a faulty logic board.
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ipod nano
sound unlock in 30 gb ipod
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