I've succesfully debricked my K4NT Black SO using the "Small debricking guide for noobs" guide and 4.0.0 kernel images. (At first I' tried 4.0.1 images, but the Kindle doesn't boot up for some reason.) It's not perfect - it can't connect to my Amazon account, and I'm not able to update the firmware nor to 4.0.1, neither to 4.1.0, but it's usable.
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