Originally Posted by geekmaster
You should use the fastboot tool WITHOUT unplugging the kindle from the USB port, which can make it dop out of fastobot mode.
That would explain it. I was having issues with virtualbox and usb, so I was rebooting from my windows partition to my linux one, and that was probably knocking it out. I just fixed the usb issues and have ssh access. Everything looks in order, just gonna dd mmcblk0p1.img and hopefully I'm set.
Thank you for your patience, and all the help when it first bricked. Awesome work!