Comment by Darthagnon

I've tried renametoabin (the one mentioned by the Mesquite jailbreak Kindle Modding Wiki in the OP), BlockKindleOTA, ShutTheBackDoor, etc. all of which do more or less the same thing to attempt blocking OTA updates on the Kindle. None work to prevent the Kindle 4 from disabling the jailbreak as soon as it gets wifi access.