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@picree: The factory reset removes the jailbreak (aka the file with developer keys). De- and re-registration may also remove the JB. Amazon could update the developer keys OTA if they need to lock out developers. So there are some options to loose the JB.
The bridge code which was likely installed during the initial JB process is executed during startup and restores the JB.
I hope this helps to understand the process a little bit.
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