PTP 650 hard reset and management issue

Hi

I have a PTP 650 link that suddenly droped down. I treid to rest it the hard way but it didnt work out. 

Is there any other solution, or a backdoor IP for the link.

You can reset all the configuration, or just the IP and Ethernet configuration, using the Recovery mode. Instructions for using the Recovery Mode are in the PTP 650 User Guide, available here: https://support.cambiumnetworks.com/files/ptp650/

There are no backdoors in PTP 650.