Pictorial Guide to Installation and Usage:
NOTE: This is not that difficult if you are careful. The following warning is not intended to strike fear into the hearts of mere mortals. Go ahead and use it if it will help you repair your bricked kindle. Just do not try things in fastboot or diagnostics that you do not understand, unless you are instructed to use them. For those who may find lengthy detailed English text difficult, here are step-by-step pictures showing how to install and use this tool:
CAUTION: Diagnostic mode and fastboot mode give you a lot of power to repair your kindle from otherwise unrepairable conditions, but they also allow you to do things that can make it worse. With great power comes great responsibility, so please be very careful when you are in fastboot mode or in diagnostics mode. When we provide step-by-step instructions, follow them carefully.
Download and unzip KindleSelectBoot.zip (download here)
Place the Kindle into USB Recovery mode:
Plug Kindle into USB port. Press Kindle power switch until LED off.
Press "Magic Key" (K4NT = Five-Way Down button, Touch = Home button).
Release power switch. Release "Magic Key".
Kindle Detected in USB Recovery Mode (USB/HID Devices)
MfgTool Bootmode Menu
MfgTool Booting Kindle to Diagnostics Menu
Kindle Touch Diagnostics Menu
From SSH: "dd if=/dev/fb0 of=/mnt/us/fb0.raw",
then use IrfanView to crop/resize/convert
608x1792 RAW image to 300x400 PNG image.
Repair your Kindle in Diagnostics (or fastboot) Mode,
using instructions and tools provided in following posts (below).
Good luck. But more importantly, have fun learning stuff!
EDIT: There are more downloads in the original post, including a sample RUNME.sh that can be launched from a diagnostics boot. It works on the Touch and the K4NT. You can install USBnet (dropbear SSH) into the diagnostics menu with it (when configured to do that).