u-boot is loaded before the kernel. Doesn't it provide a recovery menu that you can access even with a bad kernel?
Here is a thread that shows how to get to recovery mode:
https://www.mobileread.com/forums/sho...d.php?t=124861
One of the posts in that thread says this:
Quote:
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Have you tried running the recovery mode on reboot? Hold the power slider for about 15-20 seconds and then once you let go, immediately hold down the "Home" button before the screen even has a chance to flicker back on. This should Hard Reset the kindle and holding down the "Home" key while it's starting back up, you should be presented with a Recovery Mode. It will ask you to type in "RESET", which it will then run I suppose a factory reset on the kindle. You'll have to re-register and all of your books will be in the archived folder, instead of organized as you had it, because it's formatted your kindle obviously...but this is what it took to fix mine when I was having issues with the screen not changing.
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There are also posts in other threads that say you only have a few seconds to select a recovery menu item, so you may have to try this a few times before you can read all the menu options...