change HP server boot order remotely using iLo

1). SSH to HP server
2). cd system1/bootconfig1
3). show bootsource1 #please write down the bootorder number, I use 1 in this case
4). set bootsource1 bootorder=1 'this will give you the descriptive msg'
5). set bootsource$b bootorder=$p 'replace $b and $p to the device and boot order you want to set'

6). voila. reboot the machine.