I’ve been informed that sofware updates for the Amazon Fire TV and Fire TV Stick are now being distributed through the new domain
or a filtering service like OpenDNS may no longer work. Most routers are incapable of blocking secure SSL connections to an HTTPS domain due to the encrypted nature of the request. If you are relying solely on your router to block updates, you should immediately block updates on your Fire TV itself, as outlined in the first two methods of my blocking guide. With Fire OS 5, it is now possible to block updates on the Fire TV without needing root. I will update this post once I’ve been able to confirm this change myself.
I have now personally confirmed that software updates are now being served from the new domain, mentioned above, via HTTPS. I have updated my blocking guide accordingly, but be warned that many routers cannot block HTTPS requests. If you cannot use method 1 or 2 in my blocking guide, I suggest you use method 4 because DNS filtering services like OpenDNS can block HTTPS requests. To test if your router or OpenDNS is blocking the update file, you can try downloading this file and see if it fails to download or not.