Finaly my effort to put the BSNL
ONT Digisol DG-GR1321 to put in Bridge mode configeration become successfull.
All the modems supplied by the BSNL are just CHINA make and even in market same avilable.
Lot of efforts to put it in bridge mode contacting BSNL and DIDISOL ended with out any use. Factualy i droped doing that
but today i succeeded it I will try to explain step by stem
1) log in to bsnl modem (remember that once you put in bridge mode the modem log page will not come unless you give a static ip and gate way as 192.168.1.1 in our computer ip setting and connect it bia cable not in wifi. (take back up of working configeration)
2) disable remote update option in network remote menu
3) disconnect the fiber connection
4) convert to bridge mode and save configeration
5) in device manage ment upload back the configeration as default configeration
6) reboot the modem and connect back the fiver
7) set up PPOE in your powerfull
router
hope this will hep all to get the best
regards