You can use HP ILO to upgrade its own firmware, by uploading the firmware file (e.g. ilo4_255.bin) via ILO web console. This is straight forward and clear. But the ILO can do much more (but this is really a bit hidden in the web interface). From the help notes: The following firmware types can be updated from the Firmware Update page: iLO firmware System ROM (BIOS) Chassis firmware (SL and XL servers) Power Management Controller System Programmable Read more [...]

When you can't access HP ILO via Web Console anymore (e.g. because you have configured the IP address wrongly or enabled DHCP by accident), there is a possibility to configure the ILO IP settings via ESX. Login to the ESX vSphere Client Make sure that SSH is running on ESX (ESX host > Configuration > Security Profile > Services > Properties, Start SSH if it is not started) Download Putty on the Windows machine where the vSphere Client runs. Start Putty.exe and use the IP address Read more [...]