Finally Got success in getting connected with
Huawei E1750 in BSNL West Zone. Kindly note that this solution worked in
Windows only. I'm searching Linux way too
Download Firmware Update
E1750Update_11.126.13.00.157.B418.exe
Download T-Mobile Software ( Please note that this is only software works )
TM_webConnect_2_05_0036_0_Setup.exe
Install Software ( leave mobile partner installed as you might need to use your datacard as call , because this T-Mobile software doesn't have calling feature
)
Tools > Profiles
Add > Broadband
APN : bsnlnet
leave dialing number as *99***1#
click next give any name
click finish
now insert datacard in USB Slow and make sure T-Mobile software is running.
click on Broadband Tab
click on connect and it will be connected
Sorry for my laziness for not posting this topic with Pics
In case you get Error 678 ( which I just came accross ) Do the following
Tool > Profiles > Your connection > Edit
Under Broadband Type
PDP Type
select IP
and save
When i try to update the firmware it asks for a password! What did you use?