This post was the first thing on Google when I searched for this exact issue again with another Kindle 4 - connect it to Wifi and almost immediately it disables the jailbreak and a book called "Test Kindle Installation Result" from Amazon appears in the library.
It's a pity the Kindle 4 models cannot be used with Wifi because of this. Don't suppose anyone knows of a way to avoid this? I have disabled logging with BinaryRenamer and blocked updates with ShutTheBackDoor. It still happened.
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