NEC Express 5800 User Manual page 496

IMPORTANT:
 Don't execute firmware update operation the status of this server
will reach to "OS Running or EFI Manager Booted" after server
power on.
 In A1080a-D model, if another server is starting up, don't execute
firmware update operation until the status of another server will
be "OS Running or EFI Manager Booted".
 Don't execute firmware update operation until the status of this
server will reach to "Stopped" after power-off.
 In A1080a-D model, if another server is stopping, don't execute
firmware update operation until the status of another server will
reach to "Stopped".
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