A friend of mine just ordered one on my recommendation. And boy have things changed! It would appear that as folks came up with ways to do the things mentioned above, Amazon simply issues OS updates to stop them. Everything I am about to write about is, I'm sure, found somewhere else here on XDA. My intent is to save you the time it took me to figure this out this past afternoon.
FIRST - DON'T LET YOUR NEW FIRE TABLET UPDATE! What I'm going to explain applies to FireOS 5.1.3, 5.1.4 (and 22.214.171.124)
Right now today, early Oct 2016, it appears that there isn't a root tool for FireOS numbered above 5.1.2. But you easily downgrade the ones shipping today (FireOS 5.1.3, 5.1.4 and 126.96.36.199) to FireOS 5.1.2. And then existing tools work.
You'll need to download and extract:
- Run the Firmware-Downgrade-Supertool, you don't need to start adb or anything first, just double-click the "1-Start-Firmware-Downgrade-to-5.1.2.bat"
NOTE1: You'll need to allow unknown sources (In the Security Settings) and allow adb (In Developer Options. You add Developer Options by tapping Serial Number 7 times (In Device Options) see Developer Options
NOTE2: Watch the Fire Screen closely. There will be multiple popup screens/boxes. You'll need to approve adb several times. Just tap "OK"
NOTE3: When I ran it the text in the Windows cmd.exe box said it failed. But wait and a menu will appear on the fire's screen. Use the volume keys to select the 2nd item listed "from ADB" and the on/off/power button to select it. Go back to the Windows cmd.exe box and hit any key. Then the bin file for the downgrade will start transfering
- When it completes, run the AmazonFire5thGenSupertool. It has a menu that will let you do everything I listed in my opening paragraph
You've just spent a good amount of time downgrading to 5.1.2 so you could get rid of the Amazon crud. IT SHOULD GO WITHOUT SAYING, but I'll say it anyway. In the AmazonFire5thGenSupertool be sure to shut off updates!
MANY, MANY THANKS to RootJunky for the tools!!!