No Device or Unknown OS problem in BanglalionIf you have an old modem or purchased a refurbished one like Model: WU216 it may not work on Windows 10, Windows Server & other OSs.
If your modem not working then you may want to try this solution.
If your modem software showing No Device or Unknown OS then,
Uninstall the Connection Manager and install a different version of CM given below
Banglalion CM Alternative Download
Do not use two Connection Manager in the same time. It will conflict.
I personally talked to a Banglalion Customer Manager & there is no other solution for this. If this does not work, you may have to upgrade to a new Modem.
N.B: It may take little more time to find the device by CM, so be patient & hope for best.