Mix.Nerves.Preflight.ensure_fwup_version-exclamation-mark

You're seeing just the function ensure_fwup_version-exclamation-mark, go back to Mix.Nerves.Preflight module for more information.
Link to this function

ensure_fwup_version!(fwup_bin \\ "fwup", vsn_requirement \\ "~> 1.8")

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