Well take it slow......Let me know if you need any help
I am having the exact same problem with my Kindle, but I am a noob when it comes to command lines, ADB, etc. I have spent some time poking around Android to root my phones, but this is my first go around with the Kindle.
Some of your terminology confuses me a bit. When I turn my Kindle on, I get the Blue Fire logo and it says "press power button for boot menu", which I do. I then select "Recovery" which puts me into TWRP 2.6.3.1. In this mode, I am not able to Mount USB Storage because none of my Windows (Windows7 or XP) computers will recognize it.
So, my first question is, how were you able to flash the older TWRP if Windows won't recognize the Kindle?!? FYI - I don't have a factory cable.
The next question is what was your solution to the "updating partition details" issue?
Thanks.