[Fire TV Q&A, Help & Troubleshooting] harlekinwashere:
Correct - the only (software) rooting solutions available for the Fire TV Stick - ever - were either King Root or Kingo Root. There was a HW rooting method before - but it required some very precise soldering with extra thin wires and... ;)

Kingoroot and Kingroot arent optimal either - as they do act as bloatware from time to time - so the first time I rooted my Fire TV stick, was when the tutorial to "replace Kingoroot/Kingroot" with SuperSU popped up.

I froze my update schedule on firmware 5.0.5 - as I very much enjoy the features of Firestarter ("force exit app", or delete app data for a certain app are crucial every day tasks - that you can perform with firestarter MUCH faster, than with the stock UI.

Amazon started to play BS cat&mouse games with Firestarter - because it wanted you to experience banner ads, while choosing your apps - essentially. And steal its functionality. And steal UI design from Kodi and Microsofts Xbox UI. And be buddy, buddy with Plex so the "I needz it to be eazy" crowd had another monthly subscription path Amazon could cut into. (Here is how that goes. Kodi = distributed, native rendering, Plex = transcoding (why?), server dependent, login required, pays for Amazon cloud storage, gets featured on their main page, had to make concessions to never ever, allow python scripts, because an internet we understand is bad for corp. And why was Kodi banned? Because it acted like a browsing platform, Outside the amazon and affiliates ecosystem - so amazon ran a smear campaign. The product blogger was very understanding...)

The Amazon product blogger that ran this community here for a while - decided to praise them for waging war against an alternative Launcher (that btw didn't replace the original interface, but rather linked to it by default) -- instead of antagonising it as an "unprecedented move - never seen anywhere on android before" -- so we HAD to split as a community.

People who actually use the FIre TV for stuff, stayed mostly on 5.0.5 or 5.0.5.1. While the rest didnt care and not only lost Firestarter functionality, but also full adb access (its only the last remaining interface into the FireTV, why not mess with it, until its much less usable, right Amazon?) - and didn't care.

Now - using Xposed modules - you can replicate most of Firestarters features on 5.0.5.1 and above (on 5.0.5.1 you could at least use firestopper, but Amazon took that away as well (or will do so shortly - havent followed up on how far they have come.)) - using a certain Xposed Module - but as always, you have to be extra careful with them on FireTV Sticks - as you don't have a working recovery on them currently. Its best to install only modules others have tested and that are confirmed working.

Also as a result of the community split - the community never really recovered. It wasn't especially active beforehand (despite frequent help soliciting from "I bought a fully loaded... - it stopped working" folks), but with the product blogger "gone" (less interested in the hacking scene, because of the fragmentation after the "split") that wrote most of the tutorials - and put them on his blog to commercialize them - even that stopped.

Amazon so far has not halted content delivery to older firmware boxes (good idea, because despite everything else, I still buy apps) - but they could at any time, If they chose to.

Long story short. Amazon is the worst. They acted like malicious bullies, implemented tripwire routines, blacklists, froze apps they had no discernable right to even access. On devices that arent "owned" by the customers who bought them, according to some license agreement you clicked through. No one even halfheartedly whispered, that this is a real issue - and what they did was malicious -

now, its basically over. There was no pushback - the scene basically turned over on its back and surrendered under the de facto leadership of a product blogger that had them cheer for it. #cheeringforcompanyblacklists-onadeviceyoubought.

Just in case some day a historian stumbles over this - and wonders what happened.