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here is the high level steps for ucs firmware upgrade for most the environment. you may need to check additional componenets depend on the environment but the below one covers mostof the common thing s we need to check prior to the upgrade 1. checking the compatibility matrix for the esxi server with the version of ucs firmware 3. disabling the phone home alert 4. backup the ucs configuration 5. check the space on fabric interconnect and if required delete the older version of bin files 6. uploading the firmware to ucs 7. upload the enic and fnic vib to the common datastore on the esx 8. checking the maintenance policies and make sure it is in user acknowledgement. 9. upgrade the infrastructure firmware using auto install option 10. reboot the secondary fabric interconnect then using server firmware update the blade server components 13. put each blade in maintenance mode ( vmotion the vm to other 14. once the blade is up, install the enic and fnic drivers and restart the blade 15. exit from maintenance mode 16. repeat the same steps ( 12 to 14 ) for rest of the blades 17. check for any error once all the update is completed (during the update you may see increased number of errors that will resolve once ucs central is the centralized management tool for managing ucs domain. 1. make sure ntp server name and time zone matches exactly between the ucs central and ucs manager. lot of time i  get into trouble in you can set this on ucs manager ----> admin -----> time zone management  2. ucs central ip address and  shared secret pas*word is required for this goto ucs manager ----> admin ----> ucs central   ( if you not seeing this option under admin tab then check the filter under admin tab and make sure either ucs central is selected or all is selected) if you want to change some policy revolution control  to global  ( which means it will get the settings from ucs central ) you can select that as global or you can change this anytime after registration