https://support.hpe.com/hpesc/public/swd/detail?swItemId=MTX_9563f968d2824b3abd4fdd2845&swEnvOid=2000152#tab2

Reboot Requirement:
Reboot is required after installation for updates to take effect and hardware stability to be maintained.

Installation:

Flash the PLDM firmware using any below methods

Flash using iLOrest tool 
Flash using Smart Update Manager (SUM).
Flash from iLO GUI
1. To flash this firmware package, use the following iLOrest command.  See http://www.hpe.com/servers/resttool to download the latest version of the iLOrest tool.

localhost OS example:
ilorest flashfwpkg <file_name.fwpkg> 

remote example:
ilorest flashfwpkg <file_name.fwpkg> --url <iLO5_IP_Address> -u <iLO5_username> -p <iLO5_password>

2. This firmware package can also be installed with the latest version of Smart Update Manager (SUM).

Supplemental updates for supported ProLiant servers and options can be done by using SUM, which is found on the Service Pack for ProLiant (SPP) ISO.

Place the Service Pack for ProLiant on a USB key using the USB Key Creator Utility.

Place the desired firmware packages and components to be updated in the directory "\packages" on the USB key.

Update the firmware and software in the usual manner.

Reboot your system for the update to take effect immediately


3. Flash from iLO GUI

Browse iLO IP using any browser and login using the credential 
Make sure the PLDM supported adapter is present in the server
Go to iLO GUI -> Click on "Firmware and OS software" from left side  -> Click on "Update Firmware" -> Click on "Choose File" and browse to the supported PLDM file -> Then click on "Flash" button. 
Update status will be show in the Top and a log entry can be seen in Integrated Managenment Log (IML) 
Reboot the server for the firmware update to take effect.