Did you get it fixed? I'm not good at solving problems related to IPv6... Did you report the problem to TP-LINK support team (support.ro@tp-link.com)?

Did you try to unplug the adapter or uninstall the driver to see what happens?

I don't think so...VPI, VCI, connection type, username and password should be enough to set it up... Did you contact support in India? Maybe they know more about your ISP and can give you some...

1) Did you read notes of TL-MR3420_V2_150319? After upgrade, you have to reconfigure the device instead of using the backup file. 2) It is called wireless MAC filtering and it is used to block...

The utility is running again on your Windows 8? Actually, Windows 8 is not supported OS. The following is listed on specifications of MA260 on TP-LINK website. System Requirements Windows 7/Vista/XP...

Directly connecting to your modem, what's the IP address, default gateway, DNS obtained on your PC? Is it a private IP or public IP? Try to select static IP in WAN connection type and use the same IP...