This is how you fix the IPSW file downloaded as a zipped file. When jailbreaking, people have been complaining about the IPSW file being downloaded as a zip file. That's kind of weird, but Internet Explorer downloads it a a zip file. Instead of downloading it with Internet Explorer, download it with Google Chrome http://www.google.com/chrome/?hl=fr
Download your IPSW from here: http://www.felixbruns.de/iPod/firmware/
Everything should be fine :)
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