When you connect to the wifi, you are asked for a network security key? If yes, the network security key is actually your wireless password. You can refer to www.tp-link.com/en/article/?faqid=355 to...

This is a good try. It seems that TPLINK never officially announces their 3G router can works with USB tethering. From your description, the modem is able to be identified by the router. This is a...

I noticed the red blinking light comes when i charge the router after it is used for a long time. So i confirmed this with TPLINK support. They said this is because of the high temperature. However,...

Is your 3G USB dongle listed on the router's compatibility list www.tp-link.com/en/support/3g-comp-list/?model=TL-MR3420&location=1151. If your modem is shown on the compatible list; however, you can...

You can ping www.google.com within the router or computer? But you can not open a webpage?

I am not sure what do you mean by the "wireless config utility". I guess this utility has something to do with a wireless adapter rather than the router. Anyway, give a try as follows to configure...