Download the current update (i.e. ESXi 5.5 Update 2) from MyVMWare. For HP Servers, download the special HP Version. Download the .zip file, not the .iso file. Copy the .zip file to the datastore via vSphere client. Login to ESX via SSH (e.g. with PuTTY) Run the command to install the update esxcli software vib update -d "/vmfs/volumes/datastore1/Install/VMware-ESXi-5.5.0-Update2-2068190-HP-5.77.3-Nov2014-depot.zip" Shut down all guests. Put host in Maintenance Mode. Reboot VMWare Read more [...]