The official HDHomeRun app will NOT work on 2026 or later models, and will not work on the the 2025 “SELECT” version of the Fire TV stick.
These “Vega OS” versions are an entirely new version of the Fire TV that does not currently work with the HDHomeRun app. Silicondust is evaluating the situation, but cannot make any guaranties of compatibility at this time.
Fire TV devices that run “Fire OS” (based on Android) are still fully supported.
Optional: Add the HDHomeRun app to the home screen
The HDHomeRun will attempt to automatically scan for channels the first time it is connected to power, and will occasionally do a background scan every few days, but you may still need to run an initial channel scan.
The majority of Fire TV devices run an OS based on Android called Fire OS. The Fire TV Stick 4K that ends with “Select” in its name is a new and runs a different OS, and as such, the current official HDHomeRun app (and many other streaming apps) is not compatible with it.