CFBMC-5584: BMC on FAS2750 fails to load the newly installed firmware and drops to the backup firmware

Issue

Manual BMC update is showing successful
  BMC node-1*> bmc update ftp://user@xx.xx.xx.xx/SP_FW.tar.gz -f
  Downloading package...
  Uncompressing package...(md5sum=685956db282be334bca8a89cc8a9bcf6)
  Unarchiving package...
  Confirming file sizes aren't suddenly larger...
  Installing package...
  Reprocessing configuration state...
  Cleaning up...
  BMC FW Update Successful.
  Primary firmware version 11.10
  Backup firmware version 11.7
  
  You need to reboot the BMC for the new image to take effect.
  Do you want to reboot the BMC now? (y/n): y
  
  Rebooting BMC...BMC reboot notify sent to ACP

BMC booted with backup image
  Cluster::> sp show
                           IP         Firmware
  Node    Type  Status   Configured   Version   IP Address
  ------- ----- ------   ------------ --------- ------------
  node-1  BMC   online   true         11.7      xx.xx.xx.xx

New BMC is not functional if forced boot
  Cluster::*> system service-processor reboot-sp -image primary -node node-1
  
  Note: If your console connection is through the SP, it will be disconnected.
        Do you want to reboot the SP ? {y|n}: y
  
  Cluster::*> system service-processor show -node node-1 -instance
  
                                 Node: node-1
                       Type of Device: BMC
                               Status: online
                Is Network Configured: true
                    Public IP Address: xx.xx.xx.xx
                          MAC Address: d0:39:ea:xx:xx:xx
                     Firmware Version: N/A
                          Part Number: unknown
                        Serial Number: unknown
                      Device Revision: Not Applicable
       Is Firmware Autoupdate Enabled: false