Debricking Kindle without USB

The following steps can be used to debrick an Amazon Kindle

attach serial cable
boot
during boot enter recovery menu
there select "I. Initialize Partition Table (fdisk) and format FAT"
reboot
immediately after restart enter any key to stop autoboot
enter "bist" and then "fastboot"
via fastboot tool flash diags and data partitions using backed-up data
reboot
immediately after restart enter any key to stop autoboot
boot into diags (run bootargs_diags ; bootm 0xE41000)
in system diags menu export USB storage (menu "U) USB device mode")
mount USB storage, copy system partition backup file to it and correctly unmount
quit USB storage mode (menu "Q ~ to continue")
get login prompy (menu "D) Exit, Reboot or Disable Diags" and then "L) Exit to login prompt")
login as root (default password can be calculated but you may as well update your backup to alter it prior fastboot flash)
flash system partition (dd if=/mnt/base-us/mmcblk0p1.bin of=/dev/mmcblk0p1 bs=16384)
reboot