Hi @dheerajdake,
Good question! Usually some blinking orange indicates an issue with the handshake. The most frequent cause of this these days is some kind of corruption of the private key on the device. The flash can be corrupted if there is insufficient voltage or current to the device when it’s writing to the flash region. I would check to make sure your power supply / power circuits are able to support the minimum requirements for the P1.
You should be able to restore the device using the particle keys doctor in the particle-cli. Grab the device id, and then run the doctor while the device is flashing yellow, in DFU mode:
particle identify
particle keys doctor DEVICE_ID
Thanks,
David