A pre-rooted ROM of the new 18.104.22.168 software update for the Amazon Fire TV 1 has just been released by rbox. You can find the download link over at the XDA thread. If you need a refresher, here are instructions on how to install it using TWRP on a rooted device. This ROM allows those with rooted Fire TVs to update to the latest software version without losing root. See my rooting starters guide if you want to know if your device can be rooted. If you have the means, please consider donating to rbox to thank him for continuing to keep all of our rooted Fire TVs updated.
This software update does not add any new features and does not include the new interface. It is just a collection of bug fixes and security patches. The new interface has not been released to 1st-gen devices yet, but is expected to arrive later this year. I have not been able to capture the Fire TV Stick 1 update URL yet, so that’s why there is only a new Fire TV 1 ROM for now.