Try to contact support team in India. FOR INDIAN USERS ONLY (ENGLISH & HINDI SERVICE) Toll Free: 1800 2094 168 E-mail: support.in@tp-link.com Service Time: 10:00AM to 6:00PM, Monday to Saturday.

Wired connection to LAN port of W8960N works OK? Does it happen on all wireless clients? How about Wi-Fi signal strength? Try different channels and try channel width 20MHz.

What's the model number of your USB dongle? Is it in compatibility list? http://www.tp-link.com/en/support/3g-comp-list/?model=TD-W8968&location=1151 What's the hardware version of your W8968? Did...

The IP address is a fixed one? Did you change IP settings(IP address, default gateway, DNS server) after you use the new router? You use router's WAN IP and port to access remotely? WAN IP address is...

It only has bandwidth control feature. http://www.tp-link.com/en/faq-557.html

Numbers after bulid is the right firmware version. It is lucky that internet is still working as the lights are quite abnormal... Did you confirm with your ISP if it is allowed to upgrade the default...