The problem started after the OEM Recovery command was sent:
Step 3: Use fastboot to apply exploit files and reboot into recovery With the device powered off: connect your FASTBOOT USB cable(if needed) to the Kindle which should cause it to power on and enter "FASTBOOT" mode. Issue the following commands into your command/terminal window on your PC 1 at a time. (if you don't need a fastboot cable then power on the device after entering the 1st command below)
fastboot -i 0x1949 flash bootloader otter2-u-boot-prod-10.2.4.bin
fastboot -i 0x1949 flash recovery otter2-twrp-18.104.22.168-recovery.img
fastboot -i 0x1949 flash boot otter2-freedom-boot-10.4.6.img
(if using a fastboot USB cable swap to a normal USB cable before entering the next command)
fastboot -i 0x1949 oem recovery
If all has gone well, then your device should now be in recovery.