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@kbreads:
Flash a bunch of zeroes or other garbage (like, say, a cat photo JPEG) to offset 0x2adc8000. That would be the beginning of partition 4 of the flash. There's a partition header located, that when mangled triggers the kindle to reformat the user partition.
Of course, this leads to you losing all the data on your user partition. If you want to backup, then dump from there a number of 0xc3a37e00 bytes. It will take a looooooooooooooong time.
Also, you might want to try to do the same to the /var partition, which is stored in partition 3. Dump some zeros or garbage to offset 0x2a5c8000. Note that this is a rather short partition, only 4MByte, so don't flash too much garbage there.
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