Recommendations towards the diagnosis of "BMC FW Health" event log
Sensor has failed and may not be providing a valid reading warning found in the Server Health tab within the Integrated Baseboard Management Controller Web Console (Integrated BMC Web Console).
Ensure the chassis lid is properly closed and re-run the BIOS/firmware update.
Gather the System Information Retrieval Utility logs if the message still shows up and contact support with them, for analysis.
The Baseboard Management Controller (BMC) Firmware (FW) Health sensor asserts for any sensor when ten consecutive sensor errors are read. These are internal errors while attempting to read a register. For more information, refer to the System Event Log Troubleshooting Guides for Intel® Server Boards.