Edit - I have edited the instructions file as the fastboot -i 0x1949 -w command needs to be done BEFORE flashing the system.img file otherwise you can get stuck in a boot loop in rare cases. This should now work 100%.
Ok, after weeks of reading these forums I found that because of the sheer volume of help available for people with faulty or bricked Kindle Fires, it can be a little overwhelming for someone to attempt to repair their device and in some cases they can take the wrong course of action and end up making matters worse.
I thought I would write a guide for a specific common problem which is a Kindle Fire 2 stuck in a boot loop. The boot loop being that the Kindle Fire logo flashes on the screen, stays for a number of seconds and then the Kindle restarts and the same thing happens over and over. Now I know there are other similar threads around and even some programs that have automated utilities to do this but I found that most of them were not successful and I ended up doing this my way anyway. This guide is also assuming that you can enter Fastboot mode on your device.
I have attached all files needed for this guide so you don't have to go looking over the internet and clicking lots of links to get what you need.
Download the following files and follow the instructions in the word document.
Instructions - https://www.dropbox.com/s/pv4ny1qage...l%20.docx?dl=0
Android SDK - https://www.dropbox.com/s/auk5hexf1t....2-windows.exe
10.2.4 bootloader - https://www.dropbox.com/s/80xafpcj9l...rod-10.2.4.bin
boot - https://www.dropbox.com/s/333dbtrvvec8j11/boot.img
recovery - https://www.dropbox.com/s/91czoe545gf5k9q/recovery.img
system - https://www.dropbox.com/s/spbkzjqg2etoa9m/system.img