Use redsn0w for restore that is similar like happens with my iPod 3 gen so I restore with redsn0w and without problems I restore it
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== Update ==
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Use redsn0w that is like happen with my iPod 3 but my is 22 million I fix it restoring with redsn0w and without problems am already using my iPod only you most put your iPod on DFU mode and download the ipsw and restore and use your iPod maybe you lose your files but you can use your iPod again without wait 40 years XD