channels.nixos.org answers <branch>/git-revision with a redirect, which router-upgrade check did not follow: on a real router it saw an empty answer. The test channel is now an HTTP server that redirects the same way. The page labelled the running release "stable", but nixos-unstable already calls itself the next release (26.11 does not exist as a branch yet). It offers none, unstable and the stable releases listed in the code (26.05). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AeFqV9dZrK6nipHkPfyM4F