Mine (just bought today) has 5.4.5.1, so I am about to try to downgrade it. The only real JB tool I need is the Collections Manager, shame that the Kindle's own software doesn't handle collections better.
(It also had downloaded about 20Mb of the 5.6.1 update before I turned wifi off, and it did that just while I was going through the tutorial stuff that runs at first boot, so be mindful.
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