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what are U004 U006 U007
i wanna update my kindle3 3.2.1 to 3.3, at the stage 1 of 2 it shows U006
and i want to install jailbreak 0.11 it says U004, uninstall a jailbreak U007
i havent use it for long period of time and forgot what i have installed in it
what are these U00X mean
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