I can only help with one of those items -
Our 'jailbreak' is the addition of a single file, our signature certificate, to the Kindle's key store.
It has not changed since day 0.
And it is only used to verify the signature of our update_*.bin packages.
It has no effect on the operation of applications.
Now the Kindlet Jailbreak - -
That is to allow increased Java privileges for Kindlets.
It is used at run time by (java) applications.
So it is possible that that one is too old.
Get your update from NiLuJe's snapshots thread.
(That thread prefix is: 'tools' - use the index page prefix filter).
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