I am trying to update 5 ESX 3.5 hosts from Update 2 to Update 4. I have created a baseline, choosing the fixed option and selecting only update 4. When I check the status column it shows that update 4 is not applicable to my esx host, how can this be?

I chose to remediate the baseline in any case to see if anything would happen, it starts and completes within 5 mins with no errors. I then reboot the host and can see that the build number has not change from 3.5.0 110268 (update 2), it looks like it hasnt done anything . I have checked on the VC server in the downloaded updates folder and can see that update 4 folder exists. We used update manager to update all esx hosts from update 1 to update 2 without any issues.

I have rebooted the vc server, checked eventviewer on the VC there are no errors, the update manager database is fine.

Any help is much appreciated