"Kindle isn't recognized in either OS" <-- which OSs are you writing about?
Hopefully, at least one of them is *nix based (#1 choice of those, Linux).
Please define: "recognized".
*) Connect Kindle to PC with USB cable.
*) Reboot the Kindle.
*) During the couple of seconds the system exports the user file system poke the flag file named:
DO_FACTORY_RESTORE
All caps, no extension, no contents into the top of visible USB storage. (if your using Windows, the Kindle may be too quick for it.)
*) Reboot the Kindle.
Report back.
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