This holds the numeric error code returned by a remote invocation, an internal call the Downloader's FSM made to another managed endpoint such as the peer fabric interconnect, if that call failed. When a firmware download fails specifically because of a remote-side problem rather than a local disk or network issue, this code is what an admin or TAC engineer looks up to identify the exact remote failure reason behind this Downloader job. A non-zero code here alongside a failed transferState would point support staff toward, for example, a peer fabric interconnect being unreachable during a clustered image sync.