I have a ProLiant BL685c G7 and I will update iLO3 firmware
Go to http://www8.hp.com/us/en/drivers.html
Search by the product name ProLiant BL685c G7
Select your operating system. In my case Red Hat Linux Enterprise 5 Server (x86-64)
Select Firmware – Lights-Out Management and download the file
Copy the file to the server and make it executable
root@linux:~ # chmod 700 CP022551.scexe
iLO3 was running version 1.55 and was upgraded to 1.80
root@linux:~ # ./CP022551.scexe
FLASH_iLO3 v1.09 for Linux (Jan 23 2013)
(C) Copyright 2002-2013 Hewlett-Packard Development Company, L.P.
Firmware image: ilo3_180.bin
Current iLO 3 firmware version 1.55; Serial number ILOUSE253RVDV
Component XML file: CP022551.xml
CP022551.xml reports firmware version 1.80
This operation will update the firmware on the
iLO 3 in this server with version 1.80.
Current firmware is 1.55 (Jan 24 2013 )
Firmware image is 0x801664(8394340) bytes
Committing to flash part…
******** DO NOT INTERRUPT! ********
Attempting to reset device.
***** iLO 3 reboot in progress (may take up to 60 seconds.)
***** Please ignore console messages, if any.
iLO 3 reboot completed.