No official way. The update packages are incremental and not reversible.
That said, we have full backup and restore facilities explored in the developer's corner. It's well tested, but of course on your own risk. A downgrade is possible that way. Look at ATK or k3flasher for doing this. But remember: a) your own risk, b) charge your Kindle before messing with this, c) backup your kindle before flashing something else to it, d) double check parameters. You'll find more info in the developer's corner in the debrick threads.
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