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Why don't you install a current set of u-boot, main kernel, and main filesystem?
Keep in mind you can't use fastboot to install the main filesystem image - it is too big.
Just use KindleTool to open any Amazon (PW2 - if that is what your writing about) update file, version of your choice, for the binary images.
Some links available in the current jail break post, step #7, open the spoiler.
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