Currently with the NervesHub update system, there are the following channels:

Channel Deployed by… When… Notes
stable CircleCI The master branch of FBOS is pushed. Should be considered consumer ready.
staging CircleCI The staging branch of FBOS is pushed. Should be considered almost consumer-ready, but expect bugs.
beta CircleCI The beta branch of FBOS is pushed. Should be considered broken and should not be used by consumers.