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Good work.
Keep collecting the information, there may be more patterns to be found.
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Here is another theory, one that would account for apparent random jail breaking vulnerabilities.
The last steps of manufacturing are done "by hand" -
Those workers are often paid on a "piece work" basis - (paid per item completed)
People being people, will sometimes skip a step (or more) in the completion processing (nobody would do that intentionally, just to get more pieces completed, right? Right!).
Now what if one of those final steps was to "disable" the ability to install the jail break image type?
Who Q.A.s the final assembly / Q.A. people? Probably nobody.
So perhaps only the Kindles whose 'final inspection' was done by Won Hun Low can be jail broken?
You know, that guy that works the night shift on alternate Wednesdays.
Kindles don't have a "passed by #1362" tag included in the packaging, so we can't tell which ones Won Hun Low skipped the "final protection" step on.
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