How recent was your jailbreak? Recent versions bundled the MKK as well, so restarting the Kindle would restore the ability to use custom kindlets.
Certain updates e.g. gandalf are needed for running things on fw5.6.x, but if you don't have that recent jailbreak version, you can try the hotfix linked in the OP.
Last edited by eschwartz; 05-20-2015 at 10:42 AM.
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