Is there a "KFHD System.img Restore Tool" for Kindle Fire HD 8.9? topic

I just got my blacklisted Kindle Fire HD 8.9 today and want to flash a custom ROM. I did the 7 with this a while back but forgot how I did it. I do have a fastboot cable. I tried that KFFirstAide64 but I never get it to root, I gave up on it on the 7 and succeeded with the KFHD System.img Restore Tool, can I do this with the 8.9 also?