Unable to Access My Modem admin page (BSNL FTTH)

Messages
117
Location
Mysore
ISP
BSNL
Airtel Fiber
I have a BSNL FTTH (Mysore Division), my bsnl modem (Huawei hg850a) is configured in bridge mode and I use my Mi RP3 Pro router for authentication. But now, I'm unable to access my modem login page, I tried with Wifi & Lan cable nothing seems working.

I tried a whole lot of IP ranges, nothing worked. Please help.
 

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