Reset procedure for Max 8 plus

I am facing problem with net2phone MAX 8 Plus VoIP device. I recently updated the firmware of the same device. After the completion, when I manually restarted the device, I lost the access through network. Now I can only access the same via hyperterminal. I am also unable to log with all the three default logins (sysadm/manager/root), while accessing from hyperterminal. I changed the IP of the device, but it still not connected to my network. If some one faced this issue then kindly help me out. For any other details, you can reach me at net4chd@yahoo.com.

Thanks

Regards
ashish