Kindle Fire Stuck at FFF and in Fastboot Mode

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Okay so I've had my Kindle Fire rooted with TWRP and FFF for a while now. I was using TWRP 2.0 and figured I needed to update it, so I ran KFU v 0.9.6 and chose to install the latest TWRP. Unfortunately it didn't do what I hoped for. Instead it got me stuck in fastboot mode. Now whenever I turn on my Kindle I just see the FFF logo, and I am unable to load TWRP or do anything else (in fact TWRP might not even be there anymore because I'm pretty sure KFU deleted it when I chose to install the latest version). When I plug my Kindle into my PC Windows will recognize it as an Android Phone, however, ADB and KFU do not recognize it. I have been stuck in fastboot mode at least three times before, so I tried doing what has worked in the past which is to load up KFU and change the bootmode to normal. It didn't work so I kept trying...then I tried reinstalling the drivers...still nothing. I have also tried the Kindle Unbrick program which didn't help. Whenever I type the command "adb devices" it shows no devices attatched. I have tried pretty much everything else I could find on the internet and read through a countless number of threads which were of no help at all. By the way I have read about factory cables, but I don't have the money for one so I'm hoping there is another way to get past this mess. So if anyone has any ideas on how to fix this please help me out. Thanks.

What ROM were you using before you decided to update TWRP?

Originally Posted by soupmagnet

What ROM were you using before you decided to update TWRP?

I had just switched back to the stock ROM 6.3.1

Nevermind I was able to get it out of fastboot using firekit. I guess my problem was just Windows and non working drivers. But hey I would still appreciate some help on properly installing the latest TWRP and FFF preferably with Linux.