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;
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".