Please follow below steps:
a. Login into the ESXi shell via putty.
b. Go to the directory /opt/hp/tools/
c. Run the command #./hponcfg -w ilo.xml (Where ilo.xml is the file where ”-w’ switch write the configuration of ilo)
d. Edit the file ilo.xml using vi editor and fill the highlighted entry with requisites details (i.e network configuration, user id & password)
e. Run the below command to flush the modified ilo.xml file back to ilo memory.
#./hponcfg -f ilo.xml
f. Ilo will restart and after some time it’s done.