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FYI, the K1 does not (and cannot) use a jailbreak (which adds a key for signed update install packages). The K1 uses OTA (unsigned) packages only. Signing a package with the jailbreak key (OTA package) does not enable UYK (Update Your Kindle).
That actually makes it a bit simpler, and it remains that way even after updating to the newest available firmware for the K1.
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