Patching ESXi 3.5 fails with "Unable to Install" error

by dcurtis 1/6/2012 9:35:00 AM

I was trying to upgrade from ESXi 3.5 to ESXi 4.1 and wanted to make sure I had all of the latest patches on ESXi 3.5 before the upgrade per suggestions I found on the internet.  This was the first time I had ever attempted to apply any patches, so I was surprised to see the patch attempt consitently fail at 60% with an error message of "Failed to INstall Update Firmware: Unable to Install".

After performing many searches, I discovered that there was a critical patch that needed to be applied before 1 June 2011 or you would no longer be able to patch ESXi 3.5. Well, this was the first I had heard of that and now it was 2 Jan 2012 and I thought I was stuck and wouldn't be able to upgrade. I finally found a post here that suggested rolling back the date on the ESXi host, and then running try installing the patch. I rolled back the date and the patching went smoothly. I then reset the date back to the current date and proceeded with the upgrade. The process I went through will be outlined in another post.

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