am having same problem the hg8546m is not giving a chance to get login.
i checked with nmap the only port open is 53 for dns all auther ports are closed even tried the hard reset is not given any luck
I have h640v-25e bsnl gpon modem.
I can't login via telnet. I tried telnet 192.168.1.251 but it says trying..... And says no route to host.
I changed the ip of the modem to 192.168.1.1 but still no success. I work in Linux so need telnet support.
Do you think configuration files re hidden in these modem?
Recently i bought the same ONT for BSNL FTTH. But they are not able to help to configure it. Since you are famililar with it, could you guide me through this ONT configuration. It would have been a huge help for me.