BMC Updating… Please Do Not Shutdown or PowerCycle System!

We have been having an issue with our HP DL160 G5 servers lately. After a BIOS update (and on one occasion it occurred without any other updates, just a power outage and a reboot) when the server boots the system fans spin at top speed (sounds like a jet engine) and the server screen shows

BMC Updating… Please Do No Shutdown or PowerCycle System!

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