Configuring beetal 450TC1 router with BSNL - Help pls!

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Hi,
Last year I bought a beetel 450TC1 router without knowing it doesn't work with BSNL connection - I wish I had checked this forum then.
I have tried long & hard to make it work but no luck . Gave it up when the BSNL technician told me "this is only for airtel, will not work", issed-off: :depressed:
Now doing one last try before I spend another 2k on a new router. Can you guys pls help me, if its possible, to make it work?
I have looked at all the old posts here, they all deal with getting the wifi working & mention that I need to downgrade the firmware, but for me even LAN does not work.....
Is there any hope at all?
So far I followed instructions in these 2 links
techline
pradeep nayak
with no luck! No internet with LAN also. I would be eternally grateful if some one can rescue me from this situation with detailed instructions and also share the firmware needed.
Just as FYI: interms of networking/hardware I am pretty much a newbie.
Pls help
:Thank You:

 

[Rahul Vyas]

I have same modem and it working fine for me just put the settings what i say
first reset the modem at factory default
then to 192.168.1.1
click on interface setup
and select the virtual circuit as PVC2
VPI 0
VCI 35
then select the ISP as PPPoA/PPPoE
and in service name BSNL
username supplied by ISP
password is passowd
bridge interface deactivated
Connection: ALways on
and then restart your modem with current setting and once its restart and then you can surf the web
Hope it will work

 

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Thanks, Rahul Vyas. DId as you suggested but not happening....Internet light does not blink green at all.