Steps to install image from ONIE:
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1)Reboot the switch and stop it at ONIE

 +----------------------------------------------------------------------------+
 |*ONIE: Install OS                                                           |
 | ONIE: Rescue                                                               |
 | ONIE: Uninstall OS                                                         |
 | ONIE: Update ONIE                                                          |
 | ONIE: Embed ONIE                                                           |
 | DIAG: Diagnostic Mode                                                      |
 | DIAG: Burn-In Mode                                                         |
 |                                                                            |
 |                                                                            |
 |                                                                            |
 |                                                                            |
 |                                                                            |
 +----------------------------------------------------------------------------+

2)Once the switch stopped at ONIE, stop the auto discovery using the command onie-discovery-stop

ONIE:/ # onie-discovery-stop
discover: installer mode detected.
Stopping: discover... done.
ONIE:/ #
ONIE:/ #

3)Check the IP address of the switch using the native linux command, ifconfig. 
ONIE:/ # ifconfig
eth0      Link encap:Ethernet  HWaddr D8:C4:97:3C:E8:6B
          inet addr:10.27.23.212  Bcast:10.27.23.255  Mask:255.255.252.0
          inet6 addr: fe80::dac4:97ff:fe3c:e86b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:934 errors:0 dropped:0 overruns:0 frame:0
          TX packets:268 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:88243 (86.1 KiB)  TX bytes:21671 (21.1 KiB)

If there is no IP assigned, configure the IP manually using the linux commands.

4)Put the ONIE installer image into a tftp server. Once the switch got the ip address, download the ONIE installer using the
below command

ONIE:/ # onie-nos-install tftp://server-ip/onie-installer-x86_64

This command will automatically brings up the device