PMP450m-Not able to switch to the recovery mode

Hi,

I am not able to access a PMP450m through the configured IP.so, i am trying to switch the device to recovery mode. When i follow the PMP450m reset procedure i am getting only 2 to 3 ping response through the Default IP. What could be the possible issue.

Note: Device is powered up through cnPulse_SYNC ODU PoE+ port.