Originally Posted by qtybest
can the factory_reset be done by dd if=/dev/zero of=/dev/mmcblk0p3 bs=4K count=8184 ?
Perhaps your count="8184" value is too high (but it *should* work anyway). You only need enough to make the partition unmountable. Try "count=1024" instead. That is what I used.
Test your kindle with a fresh 5.0.0 kernel and main partition. Reboot multiple times BEFORE trying to install the update.
If that does not work, perhaps your update file is damaged. Try downloading it from amazon again and install the new update file. It worked for me, so it should work for you.