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First: there is no update to 5.1.1. There is an update to 5.1.0, and an update to 5.1.2. Amazon clearly states how they have to be applied.
Second: There are uninstallers for the jailbreak and the launcher. You don't need to uninstall the jailbreak, but you should uninstall the launcher. The uninstaller is in the very package that you installed it from. If you don't have the package anymore, re-download it.
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