I was in the same situation, i had uninstalled the jailbreak and usbNetwork updates but was still getting the U007 when updating my Kindle 3 from 3.2.1 to 3.3. After many tries of redownloading the update on different machines, i did a "Reset to Factory Defaults" and the the update installed. Maybe it was my having a custom developer.keystore installed? Or something went wrong in the uninstall process?
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