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It turns out that was only a temporary fix indeed. The "This device is not authorized as a test Kindle by the developer of this item" error resurfaced.
I don't know yet if it solves this issue, but finally I did manage to downgrade the firmware to 4.1.1 using Kubrick. On recent systems, the live USB just refused to boot. Even a 2015 laptop didn't work. However, it worked flawlessly on a 2010 ThinkPad (the T410s).
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