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vSphere 5.5 upgrade fails

I upgraded an ESXi host from 5.1 to 5.5u2 using the command line and downloading the image from vmware's deployment site.  It completes the update fine, but when I reboot, it gets to the point where the screen reads:  vfat loaded and then hangs until I hard reset. It reverts to the previous image and boots back to 5.1.

I have checked the logs in /var/log and there is nothing that I can find to explain this.

Any suggestions on where else to look for some clues as to why it failed to boot so I can troubleshoot?
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Is it possible that the 5.1 was installed from a vendor-customized version? There might be driver or other misconfigurations if you install a non-customized update edition over it.
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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This solved the problem.  I was using the wrong update file.  Thank you.