The "simple debricking" sticky thread in the dev corner forum shows how to go back to firmware version 5.0.0 (with no mods installed), then you can upgrade to 5.1.0, and then install hacks that work with 5.1.0. Not that many 5.0.x hacks do not work with 5.1.0 firmware. If you do not want 5.1.0 firmware, you need to deregister your kindle to prevent another OTA upgrade.
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