Done it!
I own a Paperwhite 2 2 GB
I was stupid enough to gulp whatever Amazon was throwing at me (that is 5.4.5.1} and without jailbreaking it beforehand, no less. After struggling for 1 1/2 days, I managed to downgrade to 5.4.3.2 and I thought there might be people interested in how to do it.
The mistake I was making in trying to downgrade was to disconnect the Kindle from the computer (simply pulling the plug) and then pressing the power button. And always got the error message.
Finally, today I didn't unplug the Kindle at all, I just kept the power button pressed for something like 30 seconds and it started the "update" procedure which successfully completed. Now I will just do what I had to do from the beginning, jailbreak it.
So, if you have the latest firmware, just copy it in the root and pressthe power button of the Kindle long enough. Don't bother to close the Kindle directory on the computer - it will close by itself.
Good luck and thanks to the people who came with the idea!
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