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Upgrading ESXi 5.5 Update2 to Update3

To upgrade ESXi 5.5 Update2 to Update3, you can do one of the following two options:

Upgrade the ESXi 5.5 U2 directly with Installer CD of ESXi 5.5 U3;

or

Install the complete patch of ESXi 5.5 U3 on the ESXi 5.5 U2.
To do so, follow the instructions as below:
        1- Copy the "ESXi550-201709001.zip" file on the target ESXi host.
        2- Put the ESXi host to the "Maintenance Mode".
        3- Activate the SSH service on the ESXi host.
        4- Connect to the host via SSH by Putty.
        5- Find the location of the patch file you've already copied.
        6- Run the below command:

        >esxcli software vib install -d /vmfs/volumes/...../ESXi550-201709001.zip

        7- Restart the host.
        8- Exit the "Maintenance Mode".
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