Restore2Stock - 'Restore your Kindle like it never happened'
Long story short I was rooting my kindle and then I dumbed; I wiped without booting and had a faulty download, so was stuck without an OS. I looked around all the options on here and elsewhere. Not relishing the thought of having to either pay for and wait for a fastboot cable and really wanting to get the kindle sorted (comics and such to read), I persevered and eventually stumbled along this site: http://n2aos.com/#install
At the bottom of the install page is a program to restore kindles to stock from a brick or bootloop or only having recovery etc. There are forums that will explain how to use it but its pretty straight-forward and self-explanatory. As long as you can boot into TWRP you're set and the program will do the rest for you.
I couldn't find anything on this in the threads (sorry if I missed it) so thought would put this up here for anyone who's stuck and would like a quick, easy way out so you can restart you're rooting. Saved me a lot of potential time and money and seems a much easier alternative to the other restore to stock options about.
Have a nice day guys, hope this helps someone