Right, that's another thing entirely.
Kindles booting mysteriously into diags mode when their battery drain or some other unknown series of event happened has happened before
.
Trying to replicate that yourself, on the other hand, much harder, or we'd be swimming in jailbroken Kindles (c.f., the K4, for instance, because that's the only example I can think of where we got in this way without having to resort to a factory FW).