It appears that several people are reporting that the rooting app Kingo Root is able to root some Fire TV Sticks running software version 188.8.131.52 and 184.108.40.206. When software version 220.127.116.11 was released, it blocked the previous rooting method provided by the KingRoot app, leaving no way to root devices that uppdated beyond software version 5.0.5. (Note that “Kingo Root” and “KingRoot” are two different apps.) Now it seems there’s hope for those who updated their Fire TV Sticks but still want to root.
The Kingo Root app doesn’t seem to be working for everyone. Several people, including myself, can’t get the app to root the Fire TV Stick, but several others have said it works. There is likely an additional factor that is preventing some devices from being rooted and allowing others. Nobody has yet to report that it worked on the Fire TV 1 or Fire TV 2, so it looks like this rooting method only works for the Fire TV Stick.
Even those who have managed to root successfully have reported mixed results. For some, the app works immediately and roots the device during the first attempt. For others, the app freezes at 90% during the first rooting attempt but then succeeds to root during the second attempt. Others have reported that the Fire TV Stick needs to be rebooted by holding the PLAY and SELECT button while the Kingo Root app is stuck at 90%. Running the rooting process again after rebooting has worked for some.
Even though it’s very hit or miss whether the app roots any given Fire TV Stick, it has worked for enough people that it’s worth trying out yourself if you want to root a Fire TV Stick running software version 18.104.22.168 or higher. At the very least you should block software updates until more is learned about Kingo Root and why it’s working on some devices but not others. You can download the exact version of Kingo Root that has worked for some from this link here. Just know that the trustworthiness of this app is unknown. I would recommend waiting until TWRP and a pre-rooted ROM is released for the Fire TV Stick before using Kingo Root to root your device. With TWRP and a ROM, you will be able to root with Kingo Root and then confidently wipe out anything that it may leave behind on your device.
If you do try Kingo Root, please comment below and leave as much detail about your device and the process you went through (e.g., it worked on the first try, it worked after rebooting, etc…) as possible, so that we can try to determine why it isn’t working for some people.
Based on people’s experience with Kingo Root, it appears to work consistently on version 22.214.171.124, so if it’s failing on 126.96.36.199, then allow the OTA update to install (assuming it’s available for your device already) and try Kingo Root again with 188.8.131.52