I've been digging through the forums patiently for a month (12/25/14) looking at every root method listed and none have worked. Everything seems to be so dated and focused on 2012, 2013. I thought its time to ask for help. 2014 Kindle Fire HD7 (4th gen) fireOS 4.5.2. i own fastboot cable also.
Goal is AOSP roms.
I've gotten at least 10 ADB usb drivers and found one works newest version. Able to send ADB commands.
Root with Restore bin4ry v36
Root master 1.3.6 (chinese)
Anybody have a direction to look at?