An access point will have to connect to the root router by cable connection? Is it what you need? To extend Wi-Fi range and connect to the root router wirelessly, it will be repeater or range...

So now the Wi-Fi disconnection issue is fixed? On their website, it notes, TL-WR720N V2 contains one external fixed antenna, while TL-WR720 V1 contains one internal antenna. I don't know the...

I doubt the USB port on MR3220 is broken. On web interface of MR3220, under 3G/4G, is it showing unplugged? When did you buy it? Maybe it is still under warranty?

I read that thread but I didn't realized that it would work in your case. So far so good?

What's the connection speed showing on local area connection? Try chipmaker's driver here. http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=4&Level=5&Conn=4&ProdID=10

No lights at all? What's the problem indeed?