Tried to upgrade ESXi 6.0 Build 13003896 to ESXi 6.5 Update 3 using VUM from a vCenter Appliance 6.5 that we upgraded previously from VSphere for Windows 6.0. We run Nutanix Model NX-t00-2nl3-g5 ESXi servers. The upgrade failed with the error "Cannot Execute Script on Host. I opened a case with Vmware Support and seemed to just get a quick answer to reinstall and then restore the configuration. Vmware Support told me the problem is due to a corrupt bootbank. The had me logon to the server and change to the Bootbank directory and run the ls command. Only 7 files were shown. On my other two servers that we did not attempt an upgrade on, the same command shows a full list of files, so I was told these servers are ok. We are a small shop and don't rebuild servers at all, so I would like to avoid it. Can someone provide some feedback and advice?
