I have a stand-alone ESXi 5.0 host which I was trying to install 6.0 on. The installation failed due to missing drivers of NIC card r8168. Anyways, I have created a new ISO using ESXi Customizer utility and ready to do the installation once again from the new ISO.
The problem now is that there is no 'upgrade' option available when I try to upgrade it, I am only getting 'Install' options which will wipe out the existing configs etc completely.
In summary: The host is still running fine and no issues with it. The issue is that ESXi 6.0 installer founds no existing ESXi installation on the host and suggest an installation instead of an upgrade option, this has happened after a few failed attempts to run the upgrade.
I found this Link
which says the solution is to Move the local.tgz (in /altbootbank/state.xxxxx/)
one directory higher.
I don't have a clue how to do that. Appreciate any help on which program to use and what commands to run to make sure the old installation is seen by the ESXi 6.0 installer again.